What is the role of the combining vowel in medical terms?

• A. To connect a root to a suffix or another root, typically 'o'
• B. To indicate negation
• C. To show plural
• D. To denote tense

Answer: (A)

The combining vowel serves as a smooth link between word parts, letting a root attach to a suffix or to another root without clashing consonants. It’s usually the letter o, chosen to ease pronunciation and keep medical terms pronounceable. For example, cardi/o + logy becomes cardiology, and gastr/o + enter/o + logy forms gastroenterology. If a suffix begins with a vowel, the combining vowel is typically dropped, which is why some terms like gastritis don’t insert an extra vowel. This mechanism isn’t about negation, plural, or tense—the negation and plural meanings come from prefixes or suffixes, and tense isn’t a feature of these terms.