lucrative (adj.)youdaoicibaDictYouDict[lucrative 词源字典]
early 15c., from Old French lucratif "profitable" and directly from Latin lucrativus "gainful, profitable," from lucratus, past participle of lucrari "to gain," from lucrum "gain, profit" (see lucre). Related: Lucratively; lucrativeness.[lucrative etymology, lucrative origin, 英语词源]