a. [f. FISTULA + -(I)FORM.] Of the form of a reed or tube.
1823. W. Phillips, Introd. Min. (ed. 3), Introd., p. lxxxviii. Fistuliform. Minerals occurring in round hollow columns, are termed fistuliform; fistula, in the Latin, signifies a pipe. Stalactites and iron pyrites occur fistuliform.
