‖n. [ L. ] An instrument used by the ancients in driving piles. [ 1913 Webster ]

‖n.; pl. Fistulæ [ L. ] 1. A reed; a pipe. [ 1913 Webster ]

2. A pipe for convejing water. [ Obs. ] Knight. [ 1913 Webster ]

3. (Med.) A permanent abnormal opening into the soft parts with a constant discharge; a deep, narrow, chronic abscess; an abnormal opening between an internal cavity and another cavity or the surface; as, a salivary fistula; an anal fistula; a recto-vaginal fistula. [ 1913 Webster ]

Incomplete fistula (Med.), a fistula open at one end only. [ 1913 Webster ]

a. [ L. fistularis: cf. F. fistulaire. ] Hollow and cylindrical, like a pipe or reed. Johnson. [ 1913 Webster ]

‖n. [ NL., fr. L. fistula pipe. ] (Zool.) A genus of fishes, having the head prolonged into a tube, with the mouth at the extremity. [ 1913 Webster ]

a. [ Fistularia + -oid. ] (Zool.) Like or pertaining to the genus Fistularia. [ 1913 Webster ]

v. t. & i. [ Cf. L. fistulatus furnished with pipes. ] To make hollow or become hollow like a fistula, or pipe. [ Obs. ] “A fistulated ulcer.” Fuller. [ 1913 Webster ]