Lullaby
Pronunciation : lull"a*by
Part of Speech : n.
Etymology : [From Lull, v. t. ]
Definition : 1. A song to quiet babes or lull them to sleep; that which quiets. Shak.
2. Hence: Good night; good-by. [Obs.] Shak.
Source : Webster's Unabridged Dictionary, 1913