supramaxillary

from The Century Dictionary.

• Of or pertaining to the upper jaw, in part or as a whole; related to or connected with the superior maxillary bone.
• One of several small motor branches of the facial nerve, distributed to muscles of the superior maxillary region.
• noun The superior maxillary, or upper jaw-bone, forming a part, in man nearly the whole, of the bony framework of the upper jaw, and representing more or less of the expanse of the cheek: correlated with inframaxillary.

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

• adjective Situated over the lower jaw.
• adjective Of or pertaining to the upper jaw.

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

• adjective anatomy Situated over the lower jaw.
• adjective anatomy Of or pertaining to the upper jaw.