[1] : The Collaborative International Dictionary of English v.0.48

scythe \scythe\ simacth, n. oe. sithe, as. simacethe,
   sigethe; akin to icel. sigethr a sickle, lg. segd, seged,
   seed, seid, ohg. segansa sickle, scythe, g. sense scythe, and
   to e. saw a cutting instrument. see saw. written also
   sithe and sythe.
   1. an instrument for mowing grass, grain, or the like, by
      hand, composed of a long, curving blade, with a sharp
      edge, made fast to a long handle, called a snath, which is
      bent into a form convenient for use.
      1913 webster

            the sharp-edged scythe shears up the spiring grass.
                                                  --drayton.
      1913 webster

            whatever thing
            the scythe of time mows down.         --milton.
      1913 webster

   2. antiq. a scythe-shaped blade attached to ancient war
      chariots.
      1913 webster
see also:
saw sithe sythe 

[2] : The Collaborative International Dictionary of English v.0.48

syth \syth\, sythe \sythe\, prep., adv., conj.  n.
   see sith, sithe. obs. --chaucer. --piers plowman.
   1913 webster
see also:
sith sithe 

[3] : The Collaborative International Dictionary of English v.0.48

sythe \sythe\, n.
   scythe. obs. or r.
   1913 webster

Sythe >> S Words
Sythe, definition of term: Sythe
sythe_pag1.html