bifid

from WordNet (r) 3.0 (2006)

bifid
    adj 1: divided into two lobes; "a bifid petal"

from 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]