nil per osWiktionary 原文英美词源链拉丁语Latin约前 75–公元 3 世纪nīl‘nothing’↓ 借入英语Englishnil per os词源说明From Latin nīl (“nothing”) + per (“by means of”) + ōs (“mouth”), literally “nothing by mouth”.释义短语phrase1(medicine) Nothing by mouth: nothing may be eaten or drunk.