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

Nearby words

  1. intr,
  2. intr.,
  3. intra muros,
  4. intra vires,
  5. intra vitam,
  6. intra-abdominal,
  7. intra-aortic balloon device,
  8. intra-aortic balloon pump,
  9. intra-arterial,
  10. intra-atomic

Compare intro-.

Origin of intra-

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

Can be confusedinter- intra- Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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

Medicine definitions for intra-




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

Science definitions for intra-


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.