What do a.m. and p.m. stand for?


a combining form meaning “stomach,” used in the formation of compound words:
Also, especially before a vowel, gastr-.
Origin of gastro-
< Greek, combining form of gastḗr Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for gastro
  • The gastro-pub has extensive menus for both food and drink.
  • We've had a gastro reflex test and a sleep test done and both turned up negative.
  • But as these chefs' experiences in this country show, gastro-culture shock works in both directions.
British Dictionary definitions for gastro


combining form
stomach: gastroenteritis, gastritis
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
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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).

Online Etymology Dictionary, © 2010 Douglas Harper
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gastro in Medicine

gastro- or gastr-
Stomach; gastric: gastritis.

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