Source : Webster's Revised Unabridged Dictionary (1913)

Syth \Syth\, Sythe \Sythe\, prep., adv., conj. & n.
   See {Sith}, {Sithe}. [Obs.] --Chaucer. --Piers Plowman.

Sythe \Sythe\, n.
   Scythe. [Obs. or R.]