biramous

from WordNet (r) 3.0 (2006)

biramous
    adj 1: resembling a fork; divided or separated into two
           branches; "the biramous appendages of an arthropod";
           "long branched hairs on its legson which pollen
           collects"; "a forked river"; "a forked tail"; "forked
           lightning"; "horseradish grown in poor soil may develop
           prongy roots" [syn: {bifurcate}, {biramous}, {branched},
           {forked}, {fork-like}, {forficate}, {pronged}, {prongy}]

from The Collaborative International Dictionary of English v.0.48

Biramous \Bi*ra"mous\, a. [Pref. bi- + ramous.] (Biol.)
   Having, or consisting of, two branches.
   [1913 Webster]