The Collaborative International Dictionary of English v.0.48:

Gape \Gape\, n.
   1. The act of gaping; a yawn. --Addison.
      [1913 Webster]

   2. (Zool.) The width of the mouth when opened, as of birds,
      fishes, etc.
      [1913 Webster]

   The gapes.
      (a) A fit of yawning.
      (b) A disease of young poultry and other birds, attended
          with much gaping. It is caused by a parasitic nematode
          worm (Syngamus trachealis), in the windpipe, which
          obstructs the breathing. See Gapeworm.
          [1913 Webster]