Definition of gastro- in English:

gastro-

Pronunciation: /ˈgastrəʊ/
(also gastr- before a vowel)

combining form

Relating to the stomach: gastrectomy gastroenteritis

Origin

from Greek gastēr, gastr- 'stomach'.

Definition of gastro- in:

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Word of the day guzzle
Pronunciation: ˈgəzəl
verb
eat or drink (something) greedily