Which combining form means crown or circle?

• A. Coron/o
• B. Cardi/o
• C. Therm/o
• D. Crypt/o

Answer: (A)

The main idea here is recognizing that some combining forms carry literal meanings like crown. Coron/o comes from corona, meaning crown, and it’s used for structures that form a crown-like ring around something—most notably the coronary arteries that encircle the heart. That crown-around-the-heart idea is why coron/o is the term for crown (and related around-circle concepts) in medical terminology. The other roots point to unrelated ideas: cardi/o means heart, therm/o means heat, and crypt/o means hidden. So coron/o is the best match for crown or circle.