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]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

GENA
       General Event Notification Architecture (UPnP)