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Compare supra.

Origin of infra

1730–40; < Latin infrā; cf. under


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

Origin of infra-

< Latin, representing infrā, adv. or preposition

ut infra

[oo t in-frah; English uht in-fruh]
  1. as (stated or shown) below: used in a book, text, etc.

vide infra

[wee-de in-frah; English vahy-dee in-fruh, vee-]
  1. see below (used especially to refer a reader to parts of a text). Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for infra

Historical Examples of infra

British Dictionary definitions for infra


  1. (esp in textual annotation) below; further on


  1. below; beneath; afterinfrasonic; infralapsarian

Word Origin for infra-

from Latin infrā

ut infra

  1. as below
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for infra

"under, below, further on," from Latin infra (see infra-).


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

Online Etymology Dictionary, © 2010 Douglas Harper

infra in Medicine


  1. 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.