gas.tro.lith

n.（名詞）
A pathological stony mass formed in the stomach; gastric calculus.
胃石：形成于胃中的結石塊；胃結石
A small stone found in the stomach of some reptiles, fish, and birds that aids in digestion by helping grind ingested food material.
胃石：一種小石頭，常發(fā)現(xiàn)于某些爬蟲、魚和鳥的胃中，通過幫助碾磨食物來幫助消化