fistŭla (noun F) : findo, fis-sum.
* In gen., a pipe, tube, e. g. a water-pipe (usually of lead; syn.: tubus, canalis, sypho),Cic. Rab. Perd. 11, 31; Front. Aquaed. 25 sq.; Plin. 2, 103, 106, § 224; 31, 6, 31, § 58; Ov. M. 4, 122; Inscr. Orell. 3322; 3324; 3892; the wind-pipe and gullet, Plin. 11, 37, 66, § 175; Gell. 17, 11, 4; the tubular vessels in the lungs, Plin. 11, 37, 72, § 188; in the teeth, id. 11, 37, 62, § 163; a hole in a sponge, id. 31, 11, 47, § 123 al.; the blow-hole of the whale, id. 9, 7, 6, § 19.
* In partic.
* A hollow reed-stalk, a reed, cane, Plin. 12, 22, 48, § 106; 19, 5, 23, § 66.
* Transf.
* A sort of ulcer, a fistula, Cels. 2, 8 med.; 5, 12; 7, 4; Plin. 20, 9, 33, § 55; 24, 11, 51, § 88; Cato, R. R. 157, 14; Nep. Att. 21, 3.
* Fistula sutoria, a shoemaker's punch, Plin. 17, 14, 23, § 100.
* A catheter: aeneae fistulae fiunt,Cels. 7, 26, 1 init.
* Fistula farraria, a sort of hand-mill for grinding corn, Cato, R. R. 10, 3; also called fistula serrata,Plin. 18, 10, 23, § 97.

s. TLL