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From The Collaborative International Dictionary of English v.0.48:
Warble \War"ble\, n. [Cf. Wormil.] [1913 Webster] 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 larvae of the gadfly in the backs of horses, cattle, etc. Called also warblet, warbeetle, warnles. [1913 Webster] 2. (Zool.) See Wormil. [1913 Webster]