terceyoudaoicibaDictYouDict[terce 词源字典]
"A service forming part of the Divine Office of the Western Christian Church, traditionally said (or chanted) at the third hour of the day (i.e. 9 a.m.)", Late Middle English: from Old French, from Latin tertia, feminine of tertius 'third'. Compare with tierce.[terce etymology, terce origin, 英语词源]