Of or pertaining in any way to a jaw or jaw-bone; specifically, of or pertaining to the maxilla alone, in any of the special senses of that word: as, the maxillary bones of a vertebrate; the maxillary palps of an insect.n. A jawbone; a maxillary bone, or maxilla.n. The posterior of the two bones which border the upper jaw in osseous fishes. It usually bears teeth in the soft-rayed fishes, but in the spiny-rayed fishes the teeth are confined to the prem axillary.