serous (adj.)youdaoicibaDictYouDict[serous 词源字典]
early 15c., "watery," later "of or pertaining to serum" (16c.), from French séreux (16c.) and directly from Latin serosus, from serum "watery fluid, whey" (see serum). Related: Serosity.[serous etymology, serous origin, 英语词源]