mid-13c., morn, morewen (see morn) + suffix -ing, on pattern of evening. Originally the time just before sunrise. Morning after "hangover" is from 1884; as a type of contraception, attested from 1867. Morning sickness first recorded 1879 (O.E.
had morgenwlætung). Morning glory is from 1814, in reference to the time the flowers open. Morning star "Venus in the east before sunrise" is from 1530s (O.E. had morgensteorra).