HESI A2 Vocabulary: 100 Medical Terms Every Applicant Should Know

The vocabulary section is one of the easiest places to boost your composite scoreif you know what words to study.

When pre-nursing students begin preparing for the HESI A2, they naturally devote 90% of their energy to Anatomy and Math. Because of this, the Vocabulary and General Knowledge section is often completely ignored until the night before the exam. This is a massive missed opportunity. The vocabulary section is widely considered one of the most straightforward sections on the test, making it an excellent place to pad your composite score.

If you want to maximize your score, you need a targeted list. If you are searching for the ultimate list of "hesi a2 vocabulary words to know 2025", we have you covered. You can also test your current medical vocabulary with our free HESI A2 practice quiz. Below is a breakdown of how the section works, the types of words you will see, and a high-yield study list pulled directly from recent exam trends.

How the HESI A2 Vocabulary Section Works

The Vocabulary section consists of 55 total questions (50 scored, 5 unscored experimental) with a 50-minute time limit. You will average slightly less than one minute per question.

The questions generally follow two main formats:

• Context Clues: You are given a sentence with a specific word underlined, and you must choose the word that best matches its meaning in that context. E.g., "The patient's breathing was labored."
• Direct Definition: You are given a medical term or general vocabulary word and asked to select its exact definition. E.g., "What is the meaning of the word 'bilateral'?"

Top 25 HESI A2 Vocabulary Words to Know in 2025

While the test bank contains hundreds of words, certain terms appear with remarkable frequency. Here is a high-yield list to jumpstart your memorization:

Medical terminology:

• 1. Distal: Farther away from the point of attachment (e.g., the fingers are distal to the elbow).
• 2. Exacerbate: To make a problem, bad situation, or negative feeling worse.
• 3. Latent: Present, but not active or visible (e.g., a latent viral infection).
• 4. Lethargic: Sluggish, lacking energy, or unduly tired.
• 5. Manifestation: An indication or sign of a condition (e.g., a rash is a manifestation of an allergic reaction).
• 6. Neuralgic: Pertaining to nerve pain.
• 7. Occluded: Closed, blocked, or obstructed (e.g., an occluded airway).
• 8. Patent: Open, clear, and unblocked (the opposite of occluded).
• 9. Sublingual: Administered under the tongue.
• 10. Triage: The medical screening of patients to determine their relative priority of need.

General academic vocabulary:

• 11. Abstain: To voluntarily refrain from doing something.
• 12. Assent: To give consent; to agree.
• 13. Compensatory: Offsetting or making up for something.
• 14. Contingent: Dependent on other circumstances.
• 15. Contraindication: A reason something is not advisable or should not be done.
• 16. Deficit: A deficiency or lack of something.
• 17. Discrete: Distinct, separate, and unconnected. (Do not confuse with *discreet*, which means careful or unobtrusive).
• 18. Flaccid: Limp, lacking tone, or flabby.
• 19. Impending: Occurring in the near future, about to happen.
• 20. Insidious: Proceeding in a gradual, subtle way, but with harmful effects.
• 21. Labile: Changing rapidly and often.
• 22. Ominous: Giving the impression that something bad or disastrous is going to happen.
• 23. Parameter: A characteristic or constant factor, a limit.
• 24. Precipitous: Rapid, uncontrolled (e.g., a precipitous drop in blood pressure).
• 25. Ubiquitous: Present, appearing, or found everywhere.

How to Study Prefix, Suffix, and Root Words

Memorizing lists is great, but the smartest way to study vocabulary is to memorize word roots. If you know the root, you can often deduce the meaning of a completely unfamiliar word on test day.

For example, if you know that "hepat-" means liver, and "-itis" means inflammation, you instantly know that hepatitis means inflammation of the liver. If you know that "brady-" means slow, and "tachy-" means fast, you can figure out that bradycardia is a slow heart rate and tachycardia is a fast heart rate.

The Power of Context Clues

When you encounter a word you do not know, do not panic. Read the entire sentence and look for transition words (however, therefore, despite). These words indicate whether the sentence is shifting positively or negatively. Replace the underlined word with the answer choices and ask yourself: Does this maintain the logical flow of the sentence?

If you are struggling to grasp the nuances of medical vocabulary, or if English is your second language, working with a tutor can be a game-changer. A tutor can provide you with targeted practice tests and train you on the specific root words that consistently appear on the HESI A2 exam.

Frequently Asked Questions

How many vocabulary questions are on the HESI A2?

The Vocabulary section has 50 questions with a 50-minute time limit. Questions ask you to identify word meanings, use context clues, and apply knowledge of prefixes, suffixes, and root words.

What type of vocabulary is tested on the HESI A2?

The HESI tests medical and academic vocabulary. Common topics include body parts, medical conditions, drug terminology, and general academic words. You won't be asked to define obscure words — it focuses on words you'll encounter in nursing school.

Should I memorize a vocabulary list for the HESI?

Memorizing a curated list of 100-200 medical terms is helpful, but the best strategy is learning common word roots, prefixes, and suffixes. Knowing that 'cardi-' means heart, '-itis' means inflammation, and 'hyper-' means excessive lets you decode hundreds of terms.

How can I improve my HESI vocabulary score quickly?

Study 20 word roots per day for one week. Then practice with context clue questions — read the full sentence, look for definition clues, contrast clues, or example clues. This two-pronged approach covers most HESI vocabulary questions.

Is the HESI vocabulary section difficult?

Most students find it moderate. If you read frequently and have taken college-level courses, many terms will be familiar. The challenging part is medical-specific terminology. Two weeks of focused vocabulary review is usually sufficient.