dulcet (adj.)youdaoicibaDictYouDict[dulcet 词源字典]
late 14c., from Old French doucet, diminutive of doux "sweet," earlier dulz, from Latin dulcis, from PIE *dlk-wi-, suffixed form of root *dlk-u- "sweet" (compare glucose).[dulcet etymology, dulcet origin, 英语词源]