Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

premaxillae
     See {premaxilla}