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a prefix meaning “within,” used in the formation of compound words:
Compare intro-.
Origin of intra-
< Late Latin intrā-, representing Latin intrā (adv. and preposition); akin to interior, inter-
Can be confused
inter-, intra-.

ab intra

[ahb in-trah; English ab in-truh] /ɑb ˈɪn trɑ; English æb ˈɪn trə/
adverb, Latin.
from inside; from within.

intra muros

[in-trah moo-rohs; English in-truh myoo r-ohs] /ˈɪn trɑ ˈmu roʊs; English ˈɪn trə ˈmyʊər oʊs/
adverb, Latin.
within the walls, as of a city. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for intra
Historical Examples
British Dictionary definitions for intra


within; inside: intravenous
Word Origin
from Latin intrā on the inside, within; see interior
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
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Word Origin and History for intra


word-forming element meaning "within, inside, on the inside," from Latin intra "on the inside, within," related to inter "between," from PIE *en-t(e)ro-, from root *en "in" (see in). Commonly opposed to extra-, but the use of intra as a prefix was rare in classical Latin.

Online Etymology Dictionary, © 2010 Douglas Harper
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intra in Medicine

intra- pref.
Within: intramedullary.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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intra in Science
A prefix meaning "inside" or "within," as in intravenous, within a vein.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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