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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.

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Definitions of maxilla from WordNet

maxilla (n.)
the jaw in vertebrates that is fused to the cranium;
Synonyms: upper jaw / upper jawbone / maxillary
From wordnet.princeton.edu