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1650s, with -ic + Greek gaster (genitive gastros) "stomach," by dissimilation from *graster, literally "eater, devourer," from gran "to gnaw, eat," from PIE root *gras- "to devour" (cf. Greek grastis "green fodder," Latin gramen "fodder, grass," Old English cærse "cress").
gastric gas·tric (gās'trĭk)
Of, relating to, or associated with the stomach.
A descriptive term for things pertaining to the stomach.