Definition of gastro- in English:

gastro-

Syllabification: gastro-
(also gastr- before a vowel)

combining form

Of or relating to the stomach: gastrectomy gastroenteritis

Origin

from Greek gastēr, gastr- 'stomach'.

Definition of gastro- in:

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Word of the day glee
Pronunciation: gliː
noun
great delight, especially from one's own good fortune…