infra-


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infra-

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

[From Latin īnfrā, below; see n̥dher- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

infra-

prefix
below; beneath; after: infrasonic; infralapsarian.
[from Latin infrā]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

in•fra

(ˈɪn frə)

adv.
below, esp. when used in referring to parts of a text. Compare supra.
[1730–40; < Latin infrā; compare under]

infra-

a prefix meaning “below”: infrared; infrasonic.
[< Latin, representing infrā, adv. or preposition]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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The benefits of sessions in an infra- red sauna can not be over estimated.
The joint forces helicopter was launched and, 15 minutes later, infra- red camera equipment was used to search for the man, who was found at 11.15pm.