a combining form meaning “vessel,” used in the formation of compound words: vasoconstrictor.
Also especially before a vowel, vas-.

Origin of vaso-

<Latin vās vessel + -o- Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for vaso-


before a vowel vas-

combining form

indicating a blood vesselvasodilator
indicating the vas deferensvasectomy

Word Origin for vaso-

from Latin vās vessel
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

Medical definitions for vaso-



Blood vessel:vasoconstriction.
Vas deferens:vasectomy.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.