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The Collaborative International Dictionary
Gastrology

Gastrology \Gas*trol"o*gy\, n. [Gr ?; ?, ?, stomach + ? discourse: cf. F. gastrologie.] The science which treats of the structure and functions of the stomach; a treatise of the stomach.

Douglas Harper's Etymology Dictionary
gastrology

"cooking, good eating," 1810, from gastro- "stomach" + -logy.

Wiktionary
gastrology

n. the scientific study of the stomach