November 2026 - Affixes: Prefixes & Suffixes Study Guide for nursing students in
Prefixes attach to the front of a root and suffixes to the end, changing meaning or part of speech. Knowing the common affixes lets you decode words you have never met — and clinical vocabulary recurs so consistently that a few dozen of them cover most of what a nursing programme will throw at you.
Try 4 short questions throughout this guide. Check each answer to learn from the explanation.
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The three parts of a word
Root — the core carrying the basic meaning. Cardi means heart.
Prefix — attached at the front, usually changing meaning. Brady- means slow.
Suffix — attached at the end, usually changing the part of speech, and in clinical terms often naming a condition or procedure. -ia marks a condition.
Put together: brady + cardi + a = the condition of a slow heart.
Prefixes that recur in clinical language
Prefix
Means
Example
hyper-
above, excessive
hypertension — high blood pressure
hypo-
below, deficient
hypoglycaemia — low blood sugar
brady-
slow
bradycardia
tachy-
fast
tachycardia
a-, an-
without
anaemia — without enough blood
dys-
difficult, painful, abnormal
dysphagia — difficulty swallowing
peri-
around
perioperative
poly-
many
polyuria — excessive urination
anti-
against
antibiotic
bi-
two
bilateral
Question 1 of 4
What does the prefix hypo- mean?
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Correct answer: B. Below or deficient
Hypo- marks something below normal, as in hypoglycaemia or hypotension. Above or excessive is hyper-, around is peri-, and against is anti- — and confusing the first two reverses the meaning of a clinical term entirely.
Suffixes worth knowing
Suffix
Means
Example
-itis
inflammation
appendicitis
-ectomy
surgical removal
appendectomy
-ostomy
a surgical opening
colostomy
-ology
the study of
cardiology
-osis
an abnormal condition
thrombosis
-emia / -aemia
a blood condition
anaemia
-algia
pain
neuralgia
-pathy
disease
neuropathy
Question 2 of 4
What does the suffix -ectomy indicate?
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Correct answer: C. Surgical removal
-ectomy names an operation to take something out, as in appendectomy. Inflammation is -itis, the study of something is -ology, and pain is -algia.
Suffixes change the part of speech
Outside clinical vocabulary, a suffix's main job is grammatical. -tion and -ment make nouns (document → documentation, treat → treatment), -ful and -ous make adjectives (care → careful), -ly usually makes an adverb, and -ise or -ify make verbs.
That is often what the question is really asking. When a sentence needs a noun and the choices are advise, advice, advisory and advisable, the grammar decides it before any question of meaning arises.
Hyper- and hypo- differ by one letter and mean opposite things. Two hooks: hypo- has an o and sits below, like the o in "low"; hyper- shares its e with "excess". Getting them the wrong way round is the single most consequential affix error in clinical work.
Decoding an unfamiliar word
Worked example
What does polyneuropathy mean, without looking it up?
Break it into parts: poly + neuro + pathy.
poly- means many.
neuro refers to nerves.
-pathy means disease.
Disease affecting many nerves. Splitting a long clinical word into prefix, root and suffix will get you close enough to answer a vocabulary question even when the word is completely new.
Terms to know
Affix
A prefix or suffix attached to a root.
Prefix
An affix at the front of a word.
Suffix
An affix at the end of a word.
Root
The core of a word, carrying its basic meaning.
Derivation
Making a new word by adding an affix.
Part of speech
The grammatical category a suffix often determines.
What the HESI asks most
The same core ideas appear in different wording. If you can answer these without stopping to think, you have what this section requires.
Break it into prefix, root and suffix, and assemble the meaning from the parts.
Which form of the word fits the sentence?
Decide which part of speech the slot needs, then pick the suffix that produces it.
Question 3 of 4
Which form correctly completes the sentence? The consultant gave her professional ____ on the matter.
Choose one answer, then check it.
View the Answer and Explanation
Correct answer: B. advice
The slot follows an adjective and needs a noun, and advice is the noun form. Advise is the verb, while advisable and advisory are adjectives — the suffix decides the part of speech, and the grammar of the sentence decides which one you need.
Key points
Prefixes change meaning; suffixes usually change part of speech or name a condition.
hyper- is above, hypo- is below; brady- is slow, tachy- is fast.
-itis is inflammation, -ectomy is removal, -ology is the study of.
Break an unfamiliar word into prefix, root and suffix.
When the choices differ only by suffix, the grammar of the sentence decides.
Question 4 of 4
Based on its parts, what does bradycardia mean?
Choose one answer, then check it.
View the Answer and Explanation
Correct answer: B. A slow heart rate
Brady- means slow and cardi refers to the heart. A fast rate would be tachycardia, inflammation would take -itis, and removal would take -ectomy.
HESI · Affixes
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