Why Vocabulary Is a Make-or-Break HESI A2 Section
The HESI A2 Vocabulary and General Knowledge section contains 55 scored questions that test your understanding of words you'll encounter daily in nursing school and clinical practice. Unlike other sections where you can rely on formulas or processes, vocabulary is either in your head or it isn't — making targeted practice the single most effective preparation strategy.
This practice test mirrors the actual exam format: each question presents a word and asks you to select the best definition or synonym from four choices. After each question, you'll find a detailed explanation that reinforces the concept and connects it to related medical terms.
How to Use This Practice Test
- Simulate real conditions: Set a timer for 25 minutes and answer all 40 questions without looking at the answers
- Score yourself honestly: Mark questions you guessed on — even if you guessed correctly
- Study the explanations: Every explanation includes memory tips and related terms to expand your vocabulary
- Track your weak areas: Note whether you struggle more with medical terms, prefixes/suffixes, or general vocabulary
Section 1: Medical Terminology (Questions 1–15)
Question 1
What is the best definition of "tachycardia"?
- A) Slow heart rate
- B) Rapid heart rate
- C) Irregular heart rhythm
- D) Absence of heartbeat
Answer: B) Rapid heart rate
Explanation: "Tachy-" means fast or rapid, and "-cardia" refers to the heart. Tachycardia is a heart rate exceeding 100 beats per minute at rest. The opposite is bradycardia (brady- = slow). Remember: "tachy" sounds like "taxi" — taxis go fast.
Question 2
The term "dyspnea" most accurately means:
- A) Difficulty swallowing
- B) Difficulty breathing
- C) Difficulty speaking
- D) Difficulty sleeping
Answer: B) Difficulty breathing
Explanation: "Dys-" means difficult or painful, and "-pnea" refers to breathing. Dyspnea is shortness of breath or labored breathing. Related terms: apnea (a- = without breathing), tachypnea (rapid breathing), orthopnea (difficulty breathing when lying flat).
Question 3
"Hematuria" refers to:
- A) Blood in the stool
- B) Blood in the urine
- C) Blood in the lungs
- D) Blood in the vomit
Answer: B) Blood in the urine
Explanation: "Hemat/o" means blood, and "-uria" refers to urine or urination. Compare: hematochezia (blood in stool), hemoptysis (coughing up blood), hematemesis (blood in vomit).
Question 4
What does "bilateral" mean?
- A) On one side
- B) On both sides
- C) In the middle
- D) On the back
Answer: B) On both sides
Explanation: "Bi-" means two, and "-lateral" means side. Bilateral means pertaining to both sides. Unilateral means one side only. Example: "Bilateral lung sounds clear" means both lungs sound normal.
Question 5
The term "subcutaneous" refers to:
- A) Above the skin
- B) Within the skin
- C) Beneath the skin
- D) Between skin layers
Answer: C) Beneath the skin
Explanation: "Sub-" means below or under, and "cutaneous" relates to the skin (from Latin "cutis"). Subcutaneous injections deliver medication into the fatty tissue beneath the skin. Compare: intradermal (within the skin), transdermal (through the skin).
Question 6
"Hypertension" is best defined as:
- A) Low blood pressure
- B) High blood pressure
- C) Normal blood pressure
- D) Fluctuating blood pressure
Answer: B) High blood pressure
Explanation: "Hyper-" means above, excessive, or high, and "-tension" refers to pressure. Hypertension is persistently elevated blood pressure (≥130/80 mmHg). The opposite is hypotension (hypo- = below/low).
Question 7
What does "postoperative" mean?
- A) Before surgery
- B) During surgery
- C) After surgery
- D) Instead of surgery
Answer: C) After surgery
Explanation: "Post-" means after, and "-operative" refers to surgery. Compare: preoperative (pre- = before surgery), intraoperative (intra- = during surgery), perioperative (peri- = around the time of surgery).
Question 8
"Edema" most accurately means:
- A) Bruising
- B) Swelling caused by fluid
- C) Skin rash
- D) Bone fracture
Answer: B) Swelling caused by fluid
Explanation: Edema is the accumulation of excess fluid in body tissues, causing swelling. Common types include peripheral edema (in extremities), pulmonary edema (in lungs), and cerebral edema (in the brain). Pitting edema leaves an indentation when pressed.
Question 9
The prefix "anti-" means:
- A) Before
- B) Against
- C) Around
- D) Within
Answer: B) Against
Explanation: "Anti-" means against or opposing. Examples: antibiotic (against bacteria), antipyretic (against fever), anticoagulant (against clotting), antihypertensive (against high blood pressure).
Question 10
"Benign" is the opposite of:
- A) Acute
- B) Chronic
- C) Malignant
- D) Terminal
Answer: C) Malignant
Explanation: Benign means not harmful or non-cancerous. Malignant means cancerous and potentially life-threatening. A benign tumor does not invade nearby tissues or spread, while a malignant tumor can metastasize (spread to other parts of the body).
Question 11
"Prognosis" is best defined as:
- A) The cause of a disease
- B) The identification of a disease
- C) The predicted outcome of a disease
- D) The treatment of a disease
Answer: C) The predicted outcome of a disease
Explanation: Prognosis is the expected course and outcome of a condition. Compare: diagnosis (identification of a disease), etiology (cause of a disease), treatment/therapy (management of a disease).
Question 12
What does "contraindicated" mean?
- A) Recommended for use
- B) Not advisable due to potential harm
- C) Used in combination
- D) Approved by the FDA
Answer: B) Not advisable due to potential harm
Explanation: "Contra-" means against, and "indicated" means suggested for treatment. A contraindication is a condition or factor that makes a particular treatment inadvisable. Example: Aspirin is contraindicated in patients with active bleeding disorders.
Question 13
"Sepsis" refers to:
- A) Surgical infection
- B) Life-threatening response to infection
- C) Skin infection
- D) Viral illness
Answer: B) Life-threatening response to infection
Explanation: Sepsis is the body's extreme, dysregulated response to an infection that can lead to organ failure and death. Related terms: septicemia (infection in the bloodstream), aseptic (free from contamination), antiseptic (preventing infection).
Question 14
The suffix "-ectomy" means:
- A) Incision into
- B) Surgical removal
- C) Visual examination
- D) Surgical repair
Answer: B) Surgical removal
Explanation: "-Ectomy" means surgical removal or excision. Examples: appendectomy (removal of appendix), cholecystectomy (removal of gallbladder), mastectomy (removal of breast). Compare: "-otomy" (incision into), "-oscopy" (visual examination), "-plasty" (surgical repair).
Question 15
"Afebrile" means:
- A) Having a fever
- B) Without fever
- C) Low-grade fever
- D) Recurrent fever
Answer: B) Without fever
Explanation: "A-" means without or absence of, and "febrile" means relating to fever. Afebrile indicates a normal temperature. The opposite is febrile (having a fever). An antipyretic is a medication that reduces fever (e.g., acetaminophen).
Section 2: General Vocabulary (Questions 16–28)
Question 16
"Lethargic" most nearly means:
- A) Energetic
- B) Sluggish and drowsy
- C) Anxious
- D) Confused
Answer: B) Sluggish and drowsy
Explanation: Lethargic describes a state of sluggishness, drowsiness, or lack of energy. In clinical settings, lethargy is often an early sign of infection, metabolic imbalance, or medication side effects. It falls on the consciousness scale between alert and obtunded.
Question 17
What does "exacerbate" mean?
- A) To improve a condition
- B) To make a condition worse
- C) To diagnose a condition
- D) To prevent a condition
Answer: B) To make a condition worse
Explanation: Exacerbate means to increase the severity of something. Example: "Smoking exacerbates asthma symptoms." The noun form is exacerbation — an acute worsening of a chronic condition. The opposite would be alleviate (to make less severe).
Question 18
"Ambulate" is best defined as:
- A) To examine
- B) To medicate
- C) To walk
- D) To rest
Answer: C) To walk
Explanation: Ambulate means to walk or move about. In nursing, "ambulating the patient" means helping them walk, which is crucial for recovery after surgery. Related: ambulatory (able to walk; also refers to outpatient care), non-ambulatory (unable to walk).
Question 19
"Pallor" refers to:
- A) Redness of the skin
- B) Unusual paleness
- C) Yellowing of the skin
- D) Bluish discoloration
Answer: B) Unusual paleness
Explanation: Pallor is an unhealthy pale appearance, often indicating anemia, shock, or poor circulation. Compare: erythema (redness), jaundice (yellowing from bilirubin), cyanosis (bluish color from low oxygen).
Question 20
What does "occlude" mean?
- A) To open
- B) To block or close
- C) To widen
- D) To examine
Answer: B) To block or close
Explanation: Occlude means to obstruct or close off. An occlusion is a blockage — for example, a coronary artery occlusion blocks blood flow to the heart. Related: occluded (blocked), malocclusion (misalignment of teeth).
Question 21
"Comorbidity" means:
- A) Death from multiple causes
- B) The existence of two or more conditions simultaneously
- C) A complication after surgery
- D) A hereditary disease
Answer: B) The existence of two or more conditions simultaneously
Explanation: "Co-" means together, and "morbidity" refers to disease. Comorbidity describes the presence of additional diseases or disorders alongside a primary condition. Example: A patient with diabetes and hypertension has comorbidities.
Question 22
"Palpate" most accurately means:
- A) To listen with a stethoscope
- B) To examine by touch
- C) To look at visually
- D) To tap on the body
Answer: B) To examine by touch
Explanation: Palpate means to examine by feeling with the hands. It is one of four physical examination techniques: inspection (looking), palpation (touching), percussion (tapping), and auscultation (listening with a stethoscope).
Question 23
"Precipitous" most nearly means:
- A) Gradual
- B) Sudden and steep
- C) Predictable
- D) Cautious
Answer: B) Sudden and steep
Explanation: Precipitous means extremely steep or happening very quickly and suddenly. In medical contexts, a "precipitous drop in blood pressure" means a sudden, dangerous decrease. A "precipitous delivery" is a rapid labor lasting less than 3 hours.
Question 24
"Dilate" means:
- A) To narrow
- B) To widen or expand
- C) To contract
- D) To dissolve
Answer: B) To widen or expand
Explanation: Dilate means to make wider or larger. Pupils dilate in dim light; blood vessels dilate to increase blood flow. The opposite is constrict (to narrow). Vasodilation = widening of blood vessels; vasoconstriction = narrowing of blood vessels.
Question 25
"Distal" is the opposite of:
- A) Lateral
- B) Proximal
- C) Posterior
- D) Ventral
Answer: B) Proximal
Explanation: Distal means farther from the point of attachment or origin; proximal means closer. Example: The wrist is distal to the elbow, but proximal to the fingers. These directional terms are critical for anatomical descriptions on the HESI A2.
Question 26
"Adverse" most nearly means:
- A) Favorable
- B) Harmful or unfavorable
- C) Neutral
- D) Preliminary
Answer: B) Harmful or unfavorable
Explanation: Adverse means harmful or unfavorable. An adverse drug reaction (ADR) is an unintended, harmful response to a medication. Do not confuse "adverse" with "averse" (having a strong dislike for something).
Question 27
"Potent" is best defined as:
- A) Weak and ineffective
- B) Having great power or strength
- C) Easily broken down
- D) Slow-acting
Answer: B) Having great power or strength
Explanation: Potent means having great power, influence, or effect. A potent medication produces strong effects at lower doses. Potency refers to the strength of a drug. The opposite is impotent (lacking power or strength).
Question 28
"Abstain" means:
- A) To consume excessively
- B) To refrain from
- C) To begin
- D) To substitute
Answer: B) To refrain from
Explanation: Abstain means to voluntarily choose not to do something. In healthcare: "The patient was advised to abstain from alcohol." Abstinence is the practice of refraining from something, often used in the context of substances or behaviors.
Section 3: Contextual & Applied Vocabulary (Questions 29–40)
Question 29
A nurse documents that a wound shows "purulent drainage." What does "purulent" mean?
- A) Clear and watery
- B) Containing pus
- C) Bloody
- D) Thick and mucous-like
Answer: B) Containing pus
Explanation: Purulent means containing, producing, or discharging pus. Purulent drainage from a wound typically indicates a bacterial infection. Compare drainage types: serous (clear, watery), sanguineous (bloody), serosanguineous (pink, blood-tinged).
Question 30
"The patient's condition is deteriorating." What does "deteriorating" mean?
- A) Improving rapidly
- B) Remaining stable
- C) Getting progressively worse
- D) Fluctuating unpredictably
Answer: C) Getting progressively worse
Explanation: Deteriorating means becoming progressively worse in quality, condition, or function. In healthcare, a deteriorating patient requires immediate reassessment and potential escalation of care. The opposite would be improving or ameliorating.
Question 31
"The medication should be administered via the sublingual route." Where is sublingual?
- A) Under the tongue
- B) In the cheek
- C) Through the nose
- D) Under the skin
Answer: A) Under the tongue
Explanation: "Sub-" means under, and "lingual" means tongue. Sublingual medications are placed under the tongue where they dissolve and absorb quickly into the bloodstream. Nitroglycerin for chest pain is commonly administered sublingually. Compare: buccal (in the cheek).
Question 32
"Recurrent" most nearly means:
- A) Happening once
- B) Happening repeatedly
- C) Happening accidentally
- D) Happening simultaneously
Answer: B) Happening repeatedly
Explanation: Recurrent means occurring again and again. Example: "The patient has recurrent urinary tract infections." Related terms: chronic (long-lasting), intermittent (stopping and starting at intervals), acute (sudden onset, short duration).
Question 33
"Transient" is best defined as:
- A) Permanent
- B) Temporary or brief
- C) Severe
- D) Hereditary
Answer: B) Temporary or brief
Explanation: Transient means lasting only a short time. A transient ischemic attack (TIA) is a temporary blockage of blood flow to the brain, sometimes called a "mini-stroke." The symptoms resolve within 24 hours, unlike a full stroke.
Question 34
"Efficacy" refers to:
- A) The cost of a treatment
- B) The ability to produce a desired result
- C) The side effects of a drug
- D) The dosage of a medication
Answer: B) The ability to produce a desired result
Explanation: Efficacy is the capacity to produce an intended effect or result. Drug efficacy refers to how well a medication works under ideal conditions. Do not confuse with effectiveness (how well it works in real-world conditions) or efficiency (achieving results with minimal waste).
Question 35
"Clandestine" most nearly means:
- A) Open and public
- B) Done in secret
- C) Authorized
- D) Dangerous
Answer: B) Done in secret
Explanation: Clandestine means kept secret or done in a hidden way. In nursing contexts, this word may appear in descriptions of substance use: "clandestine drug use." Synonyms include covert, surreptitious, and furtive.
Question 36
"Rationale" is best defined as:
- A) A set of rules
- B) The underlying reason or logical basis
- C) A medical procedure
- D) A patient's complaint
Answer: B) The underlying reason or logical basis
Explanation: Rationale is the set of reasons or logical basis for a course of action or belief. In nursing, providing a rationale means explaining why a particular intervention or assessment is being performed. Example: "The rationale for elevating the head of the bed is to improve breathing."
Question 37
"Atrophy" refers to:
- A) Tissue growth
- B) Wasting away or decrease in size
- C) Inflammation
- D) Tissue repair
Answer: B) Wasting away or decrease in size
Explanation: "A-" means without, and "-trophy" means nourishment or development. Atrophy is the wasting or decrease in size of a body part or tissue. Muscle atrophy occurs from disuse or lack of nerve supply. The opposite is hypertrophy (increase in size).
Question 38
"Compliance" in a medical context means:
- A) A patient's insurance coverage
- B) Following prescribed treatment plans
- C) Hospital regulations
- D) A drug's effectiveness
Answer: B) Following prescribed treatment plans
Explanation: Compliance (also called adherence) refers to a patient's ability and willingness to follow prescribed treatment plans, including taking medications, following dietary guidelines, and keeping appointments. Non-compliance is a significant barrier to treatment success.
Question 39
"Insidious" most nearly means:
- A) Rapid and obvious
- B) Gradual and subtle, with harmful effects
- C) Mild and harmless
- D) Loud and alarming
Answer: B) Gradual and subtle, with harmful effects
Explanation: Insidious describes something that develops gradually without being noticed until significant damage is done. Many chronic diseases have an "insidious onset" — such as Type 2 diabetes or chronic kidney disease. The opposite would be acute or fulminant (sudden and severe).
Question 40
"Prophylaxis" means:
- A) Treatment of existing disease
- B) Prevention of disease
- C) Diagnosis of disease
- D) Cure for disease
Answer: B) Prevention of disease
Explanation: Prophylaxis refers to measures taken to prevent disease rather than treat it. Prophylactic antibiotics are given before surgery to prevent infection. Vaccines are a form of prophylaxis. The adjective form is prophylactic (preventive).
Score Interpretation
Now that you've completed all 40 questions, calculate your score:
- 36–40 correct (90–100%): Excellent! You're well-prepared for the vocabulary section. Focus on maintaining this knowledge.
- 32–35 correct (80–89%): Good foundation. Review the questions you missed and study related terms.
- 28–31 correct (70–79%): Needs improvement. Spend extra time on medical terminology and prefix/suffix review.
- Below 28 (under 70%): Significant study needed. Use flashcards daily and focus on building your medical vocabulary base.
Next Steps to Boost Your Vocabulary Score
Whether you aced this practice test or identified gaps in your knowledge, here are your next steps:
- Study prefixes and suffixes systematically: Learning 30 common prefixes and 30 common suffixes will help you decode hundreds of medical terms
- Use flashcards daily: Spaced repetition is the most effective way to build lasting vocabulary
- Read in context: Medical terms stick better when you encounter them in realistic scenarios
- Take full-length practice tests: Simulate the real exam experience to build stamina and confidence
- Review missed questions: Don't just learn the right answer — understand why each wrong answer is incorrect