The Collaborative International Dictionary of English v.0.48:

Laminitis \Lam`i*ni"tis\, n. [NL. See Lamina, and -itis.]
   (Far.)
   Inflammation of the lamin[ae] or fleshy plates along the
   coffin bone of a horse; founder. --Youatt.
   [1913 Webster]

WordNet (r) 3.0 (2006):

laminitis
    n 1: inflammation of the laminated tissue that attaches the hoof
         to the foot of a horse [syn: laminitis, founder]