Word Origin a prefix meaning “within,” used in the formation of compound words: intramural. Origin of intra-
Late Latin intrā-,
(adv. and preposition); akin to
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for intra- within; inside intravenous Word Origin for intra-
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
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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.