nocturn (n.)youdaoicibaDictYouDict[nocturn 词源字典]
a division of the office of matins, early 13c., from Old French nocturne "evening service; curfew," from Medieval Latin nocturna, "group of Psalms used in the nocturns," from Latin nocturnus (see nocturnal).[nocturn etymology, nocturn origin, 英语词源]