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fistula (n.)

"long, narrow ulcer," late 14c., from Latin fistula "a pipe; ulcer," which is of uncertain origin. Related: Fistular; fistulous (Latin fistulosus "full of holes; tubular").

No certain etymology. The best comparison seems to be with festuca "stalk, straw" and maybe ferula "giant fennel" (if from *fesula): the forms of a "pipe" and a "stalk" are similar. The vacillation between fest- and fist- occurs within festuca itself, and might be dialectal, or allophonic within Latin. [de Vaan]

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Definitions of fistula from WordNet

fistula (n.)
a chronic inflammation of the withers of a horse;
Synonyms: fistulous withers
fistula (n.)
an abnormal passage leading from a suppurating cavity to the body surface;
Synonyms: sinus
From wordnet.princeton.edu