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 inamorata
Pronunciation: ɪˌnaməˈrɑːtə
noun
a person's female lover