The prefix infra- means which of the following?

• A. Below
• B. Above
• C. Between
• D. Around

Answer: (A)

Understanding prefixes that describe location is being tested. The prefix infra- means below or beneath, from Latin, and it’s used to indicate something that's under another structure. Infrared radiation is a classic example: it lies just below the visible red part of the spectrum. You’ll also see it in terms like infraorbital (below the orbit) or infratemporal (beneath the temple area), which reinforce the idea of being underneath or underneath a reference point. Other directional prefixes describe different relations—above would use a prefix like supra or super, between would use inter, and around would use circum—so they don’t convey the sense of below that infra- provides.