Also found in: Medical.


n. pl. su·pra·max·il·lae (-măk-sĭl′ē)
The upper jaw or jawbone.

su′pra·max′il·lar′y (-măk′sə-lĕr′ē) adj. & n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
14a Longest dorsal soft-ray about 1/2 length of head; relatively slender supramaxilla; caudal fin yellowish; yellow stripe along mid-body; head longer than body depth at origin of dorsal fin: Seriola dorsalis
The infraorbitals cover most of the upper jaw, but we can note that the maxilla is very long, as in all crossognathiforms, and that there is at least one supramaxilla starting about midlength of the maxilla.
Mouth terminal, large and oblique, jaws strong; lower jaw projecting in front of upper lip, upper jaw nearly reaching vertical to posterior margin of orbit, widest at end and maxilla truncate posteriorly, with rounded corners; supramaxilla relatively large and terminally positioned; upper jaw length 2.3 (2.3-2.4) in HL.
End of female maxilla truncate with slightly concave posterior margin; male maxilla with a flexible, scimitar-shaped lamina posteriorly almost reaching border of operculum; supramaxilla present, small, narrow and subterminally positioned.
Supramaxilla apparently present (due to dense squamation on upper jaw, presence difficult to determine with certainty).
Mouth large, maxilla reaching a vertical through rear edge of eye or slightly posterior of this point, upper jaw length 1.8 (1.7-1.9) in head; mouth oblique, gape forming angle of about 30 degrees to horizontal axis of head and body; posterior edge of maxilla straight; no supramaxilla present; lower jaw slightly inferior; upper jaw with band of small villiform teeth in about 10-12 irregular rows with toothless gap at front of jaw; lower jaw with band of similar teeth in about 6-8 irregular rows; irregular row of small teeth forming V-shape on vomer and straight, narrow row on each palatine; tongue broad based with rounded tip.
3); one pair of slender uroneurals; three epurals; a free parhypural; three thin supraneurals, generally straight; two supernumerary spines on first dorsal pterygiophore; no procumbent spines (spurs); thin Y-shaped basisphenoid, free from parasphenoid and prootics; neurocranium with frontal tabs similar to Vincentia Castelnau, 1872 (Fraser 1972: pl 31); supramaxilla absent; posttemporal smooth or with 1-3 small serrae on posterior margin; preopercle with 2-3 small, widely spaced serrae near angle, ridge smooth; infraorbitals smooth; infraorbital shelf present on third bone; ring of scleral cartilage, no ossification present; 7 branchiostegals; ceratohyal notched, suture smooth with epihyal; urohyal with short anterior process.