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The Collaborative International Dictionary
Premaxilla

Premaxilla \Pre"max*il"la\, n.; pl. Premaxill[ae]. [NL. See Pre-, and Maxilla.] (Anat.) A bone on either side of the middle line between the nose and mouth, forming the anterior part of each half of the upper jawbone; the intermaxilla. In man the premaxill[ae] become united and form the incisor part of the maxillary bone.

Wiktionary
premaxilla

n. (context anatomy English) Either of a pair of bones in front of the maxillary bones in the upper vertebrate jaw

Wikipedia
Premaxilla

The premaxilla (or praemaxilla) is one of a pair of small cranial bones at the very tip of the upper jaw of many animals, usually, but not always, bearing teeth. In humans, they are fused with the maxilla and usually termed as the incisive bone. Other terms used for this structure include premaxillary bone or os premaxillare, and intermaxillary bone or os intermaxillare.