Trifid \Tri"fid\, 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.
資料來源 : WordNet®
trifid
adj : divided into three lobes; "trifid petals"