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

< Latin, representing infrā, adv. or preposition

ut infra

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

vide infra

[wee-de in-frah; English vahy-dee in-fruh, vee-]
see below (used especially to refer a reader to parts of a text).
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infra (ˈɪnfrə)
(esp in textual annotation) below; further on

below; beneath; after: infrasonic; infralapsarian
[from Latin infrā]

ut infra (ʊt ˈɪnfrɑː)
as below

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

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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Example sentences
Cloud computing might be an important new infra structure.
The taxes of course rise each year to expand the infra structure.
The system used a camera to include your real image in the virtual game
  position detection used infra-red devices.
Would be interesting to be able to detect infra-red, ultra-violet, radio wave.
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