variant of veno- before a vowel: venipuncture.
a combining form with the meaning “vein,” used in the formation of compound words: venostasis.
Also veni-; especially before a vowel, ven-.
Origin of veno-
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.