Spav·in n.  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.
  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.
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  bog n.
  1. A quagmire filled with decayed moss and other vegetable matter; wet spongy ground where a heavy body is apt to sink; a marsh; a morass.
  Appalled with thoughts of bog, or caverned pit,
  Of treacherous earth, subsiding where they tread.   --R. Jago.
  2. A little elevated spot or clump of earth, roots, and grass, in a marsh or swamp. [Local, U. S.]
  Bog bean. See Buck bean.
  Bog bumper (bump, to make a loud noise), Bog blitter, Bog bluiter, Bog jumper, the bittern. [Prov.]
  Bog butter, a hydrocarbon of butterlike consistence found in the peat bogs of Ireland.
  Bog earth Min., a soil composed for the most part of silex and partially decomposed vegetable fiber. --P. Cyc.
  Bog moss. Bot. Same as Sphagnum.
  Bog myrtle Bot., the sweet gale.
  Bog ore. Min. (a) An ore of iron found in boggy or swampy land; a variety of brown iron ore, or limonite. (b) Bog manganese, the hydrated peroxide of manganese.
  Bog rush Bot., any rush growing in bogs; saw grass.
  Bog spavin. See under Spavin.
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  bog spavin
       n : spavin caused by collection of fluids