The combining form that means beneath or below is which of the following?

• A. Nat/o
• B. Infer/o
• C. Chlor/o
• D. Dur/o

Answer: (B)

When talking about location in the body, the combining form that means beneath or below is infer/o, coming from the Latin inferus. This form is used to build terms that indicate a position under something, such as inferolateral (below and to the side) or inferiority in a descriptive sense. The idea is to attach this root to other word parts to convey “below” clearly.

Other roots here don’t convey that sense: nat/o relates to birth (as in neonatal or perinatal), chlor/o means green (as in chlorophyll or chlorosis), and dur/o means hard or durable (as in dura mater). They describe different ideas, not beneath or below.