The Collaborative International Dictionary of English v.0.48:
Bifid \Bi"fid\, a. [L. bifidus; bis twice + root of findere to cleave or split: cf. F. bifide.] Cleft to the middle or slightly beyond the middle; opening with a cleft; divided by a linear sinus, with straight margins. [1913 Webster]WordNet (r) 3.0 (2006):
bifid adj 1: divided into two lobes; "a bifid petal"