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What is "infra-"

Longman Dictionary of Contemporary English
infra-
prefix
EXAMPLES FROM OTHER ENTRIES
▪ an infrared camera
Douglas Harper's Etymology Dictionary
infra-

word-forming element from Latin infra (adv., prep.) "below, underneath, beneath; later than, smaller, inferior to," from PIE *ndher "under" (cognates: Sanskrit adnah "below," Old English under "under, among;" see under). Opposed to super-. Its use as a prefix was rare in Latin.

Wiktionary
infra-

pre. below, beneath, inferior