a. [ L. trifidus; tri- (see Tri-) + the root of findere to split: cf. F. trifide. ] Cleft to the middle, or slightly beyond the middle, into three parts; three-cleft. [ 1913 Webster ]
a. [ Pref. tri- + fistula, fistular. ] Having three pipes. Sir T. Browne. [ 1913 Webster ]