lactose (n.)youdaoicibaDictYouDict[lactose 词源字典]
sugar from milk, 1843, from French, coined 1843 by French chemist Jean Baptiste André Dumas (1800-1884) from Latin lac (genitive lactis) "milk" (see lactation) + chemical suffix -ose (2).[lactose etymology, lactose origin, 英语词源]