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Century Dictionary and Cyclopedia

1. n. A circumscribed swelling or slough on the neck of a horse in the region of the collar, resulting from pressure of badly fitting harness or from irritating masses of dirt, sweat, or hair under the harness.

Wiktionary

1. n. obsolete A dangerous inflammatory swelling of a horse's breast, just opposite the heart.

GNU Webster's 1913

1. n. (Far.) A dangerous inflammatory swelling of a horse's breast, just opposite the heart.