[W/K] :: Spavin

  Spavin \Spav"in\, n. [OE. spaveyne, OF. esparvain, F.
     ['e]parvin; akin to OF. espervier a sparrow hawk, F.
     ['e]pervier, fr. OHG. sparw[=a]ri (G. sperber), fr. OHG.
     sparo sparrow, because this disease makes the horse raise the
     infirm leg in the manner of a sparrow hawk or sparrow. See
     Sparrow.] (Far.)
     A disease of horses characterized by a bony swelling
     developed on the hock as the result of inflammation of the
     bones; also, the swelling itself. The resulting lameness is
     due to the inflammation, and not the bony tumor as popularly
     supposed. --Harbaugh.
     [1913 Webster]
  
     Bog spavin, a soft swelling produced by distention of the
        capsular ligament of the hock; -- called also blood
        spavin.
  
     Bone spavin, spavin attended with exostosis; ordinary
        spavin.
        [1913 Webster]

  spavin
       n : a swelling of the hock joint of a horse; resulting in
           lameness