Lewis & Short

fistŭlōsus, a, um, adj. [fistula].

  1. I. Pipeshaped, full of holes, porous (post-Aug.): terra bibula et pumicis vice fistulosa, Plin. 18, 11, 29, § 110; so, terra, id. 17, 5, 3, § 34: telum culicis sorbendo fistulosum, hollow, id. 11, 2, 1, § 3: aculeus, id. 11, 37, 65, § 173: lapis, porous, id. 36, 23, 53, § 174: densitas spongiae, id. 27, 8, 45, § 69: caseus, Col. 7, 8, 5.
  2. II. Having fistulas, fistulous: cancer, Cato, R. R. 157, 3.