"fistulas" in the noun sense
1. fistulous withers, fistula
a chronic inflammation of the withers of a horse
2. fistula, sinus
an abnormal passage leading from a suppurating cavity to the body surface
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License