Fistula
FIS'TULA, noun [Latin ; Eng. whistle.]
1. Properly, a pipe; a wind instrument of music, originally a reed.
2. A surgery, a deep, narrow and callous ulcer, generally arising from abscesses. It differs from a sinus, in being callous.
Fistula lachrymalis, a fistula of the lachrymal sac, a disorder accompanied with a flowing of tears.