schizognathous

from The Century Dictionary.

• In ornithology, having the bony palate cleft in such a way that in the dry skull “the blade of a thin knife can be passed without meeting with any bony obstacle from the posterior nares alongside the vomer to the end of the beak” (Huxley); exhibiting schizognathism in the structure of the bony palate: as, aschizognathous bird; a schizognathous palate; a schizognathous type of palatal Structure.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Zoöl.) Having the maxillo-palatine bones separate from each other and from the vomer, which is pointed in front, as in the gulls, snipes, grouse, and many other birds.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective zoology having the maxillopalatine bones separate from each other and from the vomer, which is pointed in front, as in the gulls, snipes, and many other birds