Source : Webster's Revised Unabridged Dictionary (1913)

Fistular \Fis"tu*lar\, a. [L. fistularis: cf. F. fistulaire.]
   Hollow and cylindrical, like a pipe or reed. --Johnson.

Source : WordNet®

fistular
     adj : like a reed or tube [syn: {fistulate}, {fistulous}]