What combining form means 'tail'?

• A. Amyl/o
• B. Endo-
• C. Caud/o
• D. Lei/o

Answer: (C)

The meaning of tail is expressed by the combining form caud/o. This root is used to form terms that describe the tail or tail-end direction, such as caudal meaning toward the tail or the caudal fin of a fish. Its Latin origin directly conveys the concept of a tail, which is why it’s the best match for this question.

Amyl/o means starch (as in amylase, an enzyme that acts on starch), Endo- means within or inner, and Lei/o relates to smoothness or smooth muscle (as in leiomyoma). These do not convey the idea of a tail.