Source : Webster's Revised Unabridged Dictionary (1913)

Warble \War"ble\, n. [Cf. {Wormil}.]
   1. (Far.)
      (a) A small, hard tumor which is produced on the back of a
          horse by the heat or pressure of the saddle in
          traveling.
      (b) A small tumor produced by the larv[ae] of the gadfly
          in the backs of horses, cattle, etc. Called also
          {warblet}, {warbeetle}, {warnles}.

   2. (Zo["o]l.) See {Wormil}.