Definition of gastro- in English:

gastro-

Pronunciation: /ˈɡastrəʊ/
(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 animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal