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definitions
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gastr-

  1. variant of gastro- before a vowel: gastrectomy.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

gastr- in Medicine

gastr-

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