lullaby

[ luhl-uh-bahy ]
/ ˈlʌl əˌbaɪ /

noun, plural lull·a·bies.

a song used to lull a child to sleep; cradlesong.
any lulling song.

verb (used with object), lull·a·bied, lull·a·by·ing.

to lull with or as with a lullaby.

Origin of lullaby

1550–60; equivalent to lulla, lulla(y), interjection used in cradlesongs (late Middle English lullai, lulli) + -by, as in bye-bye
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British Dictionary definitions for lullaby

lullaby

/ (ˈlʌləˌbaɪ) /

noun plural -bies

a quiet song to lull a child to sleep
the music for such a song

verb -bies, -bying or -bied

(tr) to quiet or soothe with or as if with a lullaby

Word Origin for lullaby

C16: perhaps a blend of lull + goodbye
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012