prefix
Etymology: Latin infra below, underneath — more at under
1.
a. : below : lower in status than — especially in adjectives formed from adjectives
infra human
b. : after : later than
infra lapsarian
2. : within — especially in adjectives formed from adjectives
infra territorial
3. : below in a scale or series — especially in adjectives formed from adjectives
infra red
4. : below or beneath (a designated part of the anatomy) — especially in adjectives formed from adjectives
infra costal