also gastero-, before vowels gastr-, scientific word-forming element meaning "stomach," from Greek gastro-, combining form of gaster (genitive gastros) "belly, paunch; womb" (see gastric). Also used in compounds in ancient Greek, as gastrobarys "heavy with child."
"acute inflammation of the bowels," 1808, medical Latin, coined c. 1750 by French pathologist François-Boissier de la Croix de Sauvages (1706-1767), from enteron "intestine" (see enteric) + -itis "inflammation."
<a href="https://www.etymonline.com/word/gastro-enteritis">Etymology of gastro-enteritis by etymonline</a>
Harper, D. (n.d.). Etymology of gastro-enteritis. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/gastro-enteritis