geriatric (adj.)youdaoicibaDictYouDict[geriatric 词源字典]
1909, formed in English from Latinized forms of Greek geras, geros "old age" (from PIE root *gere- (1) "to grow old;" see gerontology) + iatrikos "of a physician," from iatros (see -iatric).[geriatric etymology, geriatric origin, 英语词源]