Source : Webster's Revised Unabridged Dictionary (1913)

Vetch \Vetch\, n. [Also fitch; OE. ficche, feche, for veche, OF.
   veche, vecce, vesche, vesce, F. vesce, fr. L. vicia.] (Bot.)
   Any leguminous plant of the genus {Vicia}, some species of
   which are valuable for fodder. The common species is {V.
   sativa}.

   Note: The name is also applied to many other leguminous
         plants of different genera; as the chichling vetch, of
         the genus {Lathyrus}; the horse vetch, of the genus
         {Hippocrepis}; the kidney vetch ({Anthyllis
         vulneraria}); the milk vetch, of the genus
         {Astragalus}; the licorice vetch, or wild licorice
         ({Abrus precatorius}).

Source : WordNet®

vetch
     n : any of various climbing plants of the genus Vicia having
         pinnately compound leaves that terminate in tendrils and
         small variously colored flowers; includes valuable forage
         and soil-building plants