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Medical Terminology Suffixes & Prefixes Cheat Sheet
A printable reference covering medical prefixes, suffixes, roots, word-building rules, and common term meanings for grades 9-12.
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Medical terminology uses prefixes, roots, and suffixes to build precise words for body systems, conditions, tests, and treatments. This cheat sheet helps students break long medical words into smaller parts so the meaning becomes easier to understand. It is useful for reading health science texts, labeling anatomy, and preparing for medical career coursework. A prefix usually comes at the beginning of a term and changes the meaning by showing number, location, time, or condition. A root gives the main meaning, often naming a body part or body system. A suffix usually comes at the end and often tells the condition, disease, procedure, or specialist involved.
Key Facts
- A medical word often follows the pattern prefix + root + suffix, such as tachy + cardi + ia = tachycardia, meaning a condition of fast heart rate.
- A prefix changes the beginning meaning of a word, such as hypo- meaning below or low and hyper- meaning above or excessive.
- A suffix changes the ending meaning of a word, such as -itis meaning inflammation and -ectomy meaning surgical removal.
- A root gives the core meaning of the term, such as cardi meaning heart, derm meaning skin, and neur meaning nerve.
- A combining vowel, usually o, may connect a root to another word part, as in cardiology = cardi + o + logy.
- When a suffix begins with a vowel, the combining vowel is often dropped, as in gastritis = gastr + itis, not gastroitis.
- The suffix -algia means pain, so neuralgia means nerve pain and myalgia means muscle pain.
- The prefixes brady- and tachy- describe speed, with bradycardia meaning slow heart rate and tachycardia meaning fast heart rate.
Vocabulary
- Prefix
- A word part placed at the beginning of a medical term to change its meaning.
- Suffix
- A word part placed at the end of a medical term that often names a condition, procedure, disease, or specialist.
- Root
- The main word part that carries the core meaning, often a body part or body system.
- Combining vowel
- A vowel, most often o, used to connect word parts and make a medical term easier to pronounce.
- Combining form
- A root plus a combining vowel, such as cardi/o for heart or neur/o for nerve.
- Word analysis
- The process of breaking a medical term into word parts to determine its meaning.
Common Mistakes to Avoid
- Confusing hypo- and hyper- is wrong because hypo- means low or below normal, while hyper- means high or excessive.
- Assuming every medical word has a prefix is wrong because many terms have only a root and suffix, such as arthritis = arthr + itis.
- Keeping the combining vowel before a vowel-starting suffix is often wrong because gastritis uses gastr + itis, not gastroitis.
- Memorizing a whole term without checking word parts can lead to wrong meanings because the suffix may change the term from a body part to a disease or procedure.
- Mixing up -otomy and -ectomy is wrong because -otomy means cutting into, while -ectomy means surgical removal.
Practice Questions
- 1 Break down the term bradycardia into prefix, root, and suffix, then write its meaning.
- 2 A patient has dermatitis. Identify the root and suffix, then explain what the term means.
- 3 Build a medical term that means surgical removal of the tonsils using tonsill and -ectomy.
- 4 Explain why understanding prefixes and suffixes can help a student interpret an unfamiliar medical term without memorizing the whole word.