Which prefix means 'within' in medical terms?

Which prefix means 'within' in medical terms?

• A. intra-
• B. hypo-
• C. macro-
• D. peri-

Answer: (A)

The key idea is how prefixes convey where something is relative to a structure. Intra- means inside or within a boundary. It’s used in terms like intraocular (inside the eye), intracardiac (inside the heart), or intracranial (inside the skull), to show location being within that structure. The other prefixes fit different relationships: hypo- means under or below, macro- means large, and peri- means around. So they don’t express the sense of being inside as clearly as intra- does. A handy cue: intra- = inside.

The key idea is how prefixes convey where something is relative to a structure. Intra- means inside or within a boundary. It’s used in terms like intraocular (inside the eye), intracardiac (inside the heart), or intracranial (inside the skull), to show location being within that structure. The other prefixes fit different relationships: hypo- means under or below, macro- means large, and peri- means around. So they don’t express the sense of being inside as clearly as intra- does. A handy cue: intra- = inside.