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

< Greek, combining form of gastḗr Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gastro- or (often before a vowel) gastr-
combining form
stomach: gastroenteritis; gastritis
[from Greek gastēr]
gastr- or (often before a vowel) gastr-
combining form
[from Greek gastēr]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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Example sentences
The gastro-pub has extensive menus for both food and drink.
But as these chefs' experiences in this country show, gastro-culture shock works in both directions.
We've had a gastro reflex test and a sleep test done and both turned up negative.
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