Which prefix means between, among?

• A. Inter-
• B. Intra-
• C. Peri-
• D. Retro-

Answer: (A)

Inter- means between or among, capturing the idea of relationships that connect two or more things. In medical terms you see it in intervertebral (between vertebrae), intercellular (between cells), or intercostal (between the ribs). The other prefixes describe different spatial ideas: intra- means inside or within, peri- means around, and retro- means backward or behind. So inter- best fits the sense of “between, among.”