Source : Webster's Revised Unabridged Dictionary (1913)

Vomer \Vo"mer\, n. [L., a plowshare.] (Anat.)
   (a) A bone, or one of a pair of bones, beneath the ethmoid
       region of the skull, forming a part a part of the
       partition between the nostrils in man and other mammals.
   (b) The pygostyle.

Source : WordNet®

vomer
     n : thin trapezoidal bone of the skull forming the posterior and
         inferior parts of the nasal septum