Dictionary  fis•tu•laPronunciation: (fis'choo-lu), [key] —n., —pl. -las, -laePronunciation: (-lē"). [key] 1. Pathol.a narrow passage or duct formed by disease or injury, as one leading from an abscess to a free surface, or from one cavity to another. 2. Surg.an opening made into a hollow organ, as the bladder or eyeball, for drainage. 3. Vet. Pathol.any of various suppurative inflammations, as in the withers of a horse (fis'tulous with'ers), characterized by the formation of passages or sinuses through the tissues and to the surface of the skin. 4. Obs.a pipe, as a flute. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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