within a vein.
of, pertaining to, employed in, or administered by injection into a vein: an intravenous solution.
an intravenous injection.
intravenous feeding. Abbreviation: IV

1840–50; intra- + venous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intravenous (ˌɪntrəˈviːnəs)
anatomy IV, Abbreviations (esp of an injection): i.v. within a vein: an intravenous injection

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1847, coined in Eng. from intra- "within, inside" + L. venous, from vena "vein" (see vein).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

intravenous in·tra·ve·nous (ĭn'trə-vē'nəs)
Abbr. IV
Within or administered into a vein.

in'tra·ve'nous·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
intravenous   (ĭn'trə-vē'nəs)  Pronunciation Key 
  1. Existing or occurring within a vein.

  2. Administered into a vein, as an injection.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
intravenous [(in-truh-vee-nuhs)]

A descriptive term for things within a vein. Intravenous feeding or medication is the passing of nutrients or medicines into a vein through a tube.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Intravenous feedings may be needed in life-threatening situations.
After he was strapped in place and the intravenous lines inserted, the
  witness-room curtains were opened.
Soon cases were also detected in intravenous drug users and recipients of blood
Respiratory therapists do not usually give injections or intravenous drugs.
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