The Collaborative International Dictionary of English v.0.48:

Ethmovomerine \Eth`mo*vo"mer*ine\, n. [Ethmoid + vomerine.]
   (Anat.)
   Pertaining to the region of the vomer and the base of the
   ethmoid in the skull.
   [1913 Webster]

   Ethmovomerine plate (Anat.), a cartilaginous plate beneath
      the front of the fetal brain which the ethmoid region of
      the skull is developed.
      [1913 Webster]