Definition of lullaby noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈlʌləbaɪ//
; NAmE NAmE//ˈlʌləbaɪ//
(pl. lullabies) Babies, Pieces of music
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a soft gentle song sung to make a child go to sleep She sang her baby a lullaby. See related entries: Babies, Pieces of music Word Originmid 16th cent.: from lull + bye-bye, a sound used as a refrain in lullabies; compare with bye-byes.
See the Oxford Advanced American Dictionary entry: lullaby