Warble

1. n. See Wormil.
2. n. A small, hard tumor which is produced on the back of a horse by the heat or pressure of the saddle in traveling.
3. n. A small tumor produced by the larvae of the gadfly in the backs of horses, cattle, etc. Called also warblet, warbeetle, warnles.
4. v. t. To cause to quaver or vibrate.
5. v. i. To be quavered or modulated; to be uttered melodiously.
6. v. i. To sing in a trilling manner, or with many turns and variations.
7. v. i. To sing with sudden changes from chest to head tones; to yodel.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.