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."
word-forming element meaning "surgical removal," from Latinized form of Greek -ektomia "a cutting out of," from ektemnein "to cut out," from ek "out" (see ex-) + temnein "to cut" (from PIE root *tem- "to cut").
<a href="https://www.etymonline.com/word/gastrectomy">Etymology of gastrectomy by etymonline</a>
Harper, D. (n.d.). Etymology of gastrectomy. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/gastrectomy