DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Gena \Ge"na\, [L., the cheek.] (Zool.)
         (a) The cheek; the feathered side of the under mandible of
             a bird.
         (b) The part of the head to which the jaws of an insect
             are attached.
             [1913 Webster]