The Collaborative International Dictionary of English v.0.48:

Springhalt \Spring"halt`\ (-h[add]lt`), n. (Far.)
   A kind of lameness in a horse. See Stringhalt. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Stringhalt \String"halt`\, n. (Far.)
   An habitual sudden twitching of the hinder leg of a horse, or
   an involuntary or convulsive contraction of the muscles that
   raise the hock. [Written also springhalt.]
   [1913 Webster]