gas.tro.lith
n.（名词）A pathological stony mass formed in the stomach; gastric calculus.胃石：形成于胃中的结石块；胃结石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：一种小石头，常发现于某些爬虫、鱼和鸟的胃中，通过帮助碾磨食物来帮助消化
