Which prefix means Under, Below?

• A. sub-
• B. eu-
• C. intra-
• D. end-

Answer: (A)

Under or below is shown by the prefix sub-. It comes from Latin and is used in medical terms to indicate a position beneath something, as in subcutaneous (beneath the skin), submucosal (below the mucous membrane), or subcostal (below a rib). The other prefixes point to different ideas: eu- means good or normal, intra- means within, and end- (usually written as endo-) means inside or within. So sub- is the one that specifically conveys “under, below.”