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gastro-

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  1. a combining form meaning “stomach,” used in the formation of compound words: gastrology.
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Also especially before a vowel, gastr-.

Origin of gastro-

< Greek, combining form of gastḗr
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for gastro-

gastro-

often before a vowel gastr-

combining form
  1. stomachgastroenteritis; gastritis
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Word Origin

from Greek gastēr
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 gastro-

scientific word-forming element meaning "stomach," before vowels gastr-, from Greek gastro-, comb. form of gaster (genitive gastros) "belly, paunch" (see gastric).

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Online Etymology Dictionary, © 2010 Douglas Harper

gastro- in Medicine

gastro-

pref.
  1. Stomach; gastric:gastritis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.