bi·ra·mous /(ˌ)baɪˈreməs/
  二支的
  bi·ra·mous /(ˈ)baɪˈreməs/ 形容詞
  具二支的,二支的
  Bi·ra·mous a.  Biol. Having, or consisting of, two branches.
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  biramous
       adj : 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, branched, forked, forficate,
              pronged, prongy]