infra-

infra-

a prefix meaning “below,” used, with second elements of any origin, in the formation of compound words: infrasonic; infrared.

Origin:
< Latin, representing infrā, adv. or preposition

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Collins
World English Dictionary
infra-
 
prefix
below; beneath; after: infrasonic; infralapsarian
 
[from Latin infrā]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

infra-
from L. infra (adv., prep.) "below, underneath, beneath," from PIE *ndher (cf. Skt. adnah "below," O.E. under "under, among;" see under). Opposed to super-. Its use as a prefix was rare in Latin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

infra- pref.
Inferior to, below, or beneath: infrasonic.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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