maxilla n.

"a jaw, a jawbone," 1670s, from Latin maxilla "upper jaw," diminutive of mala "jaw, cheekbone." "Maxilla stands to mala as axilla, 'armpit,' stands to ala 'wing'" [Klein]. Especially a bone of the upper jaw (maxilla superior) as distinguished from the mandible or lower jaw (maxilla inferior). Related: Maxillar; maxilliform.