matutinal (adj.)youdaoicibaDictYouDict[matutinal 词源字典]
1650s, from Latin matutinalis "pertaining to morning," from matutinus "of or pertaining to the morning," from Matuta, name of the Roman goddess of dawn, related to maturus “early” (see mature (v.)). Earlier in same sense was matutine (mid-15c.). Related: Matutinally.[matutinal etymology, matutinal origin, 英语词源]