Defn: To make hollow or become hollow like a fistula, or pipe. [Obs.]
"A fistulated ulcer." Fuller.

FISTULE
Fis"tule, n.

Defn: A fistula.

FISTULIFORM
Fis"tu*li*form ( or ), a. Etym: [Fistula + -form.]

Defn: Of a fistular form; tubular; pipe-shaped.
Stalactite often occurs fistuliform. W. Philips.

FISTULOSE
Fis"tu*lose`, a. Etym: [L. fistulosus.]

Defn: Formed like a fistula; hollow; reedlike. Craig.

FISTULOUS
Fis"tu*lous, a. Etym: [Cf. F. fistuleux.]

1. Having the form or nature of a fistula; as, a fistulous ulcer.

2. Hollow, like a pipe or reed; fistulose. Lindley.