a prefix meaning “within,” used in the formation of compound words: intramural.

Compare intro-.

Origin of intra-

< Late Latin intrā-, representing Latin intrā (adv. and preposition); akin to interior, inter-
Can be confusedinter- intra-

ab intra

[ahb in-trah; English ab in-truh]

adverb Latin.

from inside; from within.

intra muros

[in-trah moo-rohs; English in-truh myoo r-ohs]

adverb Latin.

within the walls, as of a city. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for intra

Historical Examples of intra

  • A boat was leaving for Intra, so he went on board, and at Intra took the train for Milan.

    The Devourers

    Annie Vivanti Chartres

  • But Sophy said that she had ordered a carrozzella to go shopping in Intra for Bobby.

    Shadows of Flames

    Amelie Rives

  • At three she went upstairs to change her tea-gown for the drive to Intra.

    Shadows of Flames

    Amelie Rives

  • Intra quatuor decim dies, commodatum ni redderis, neque belle custodieris, alio tempore dominus: Non habeo dicet.

    French Book-plates

    Walter Hamilton

  • Quando vis exprimere quia brevis est, primis labris sonat; quando exprimis longam, intra palatum sonat.

British Dictionary definitions for intra



within; insideintravenous

Word Origin for intra-

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

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

intra in Medicine



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

intra in Science


A prefix meaning “inside” or “within,” as in intravenous, within a vein.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.