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supramaxilla
supramaxilla n. 
/ˌsjuːprəmakˈsɪlə/,
Brit. /ˌsuːprəmakˈsɪlə/
, /ˌsuːprəmakˈsɪlə//ˌsjuːprəmakˈsɪlə/U.S. /ˌsuprəˌmækˈsɪlə/
(a) Anatomy the maxilla or upper jaw (now disused); (b) Zoology (in some fishes) each of one or more small bones lying above or overlapping the posterior end of the maxillary bone./ˌsuprəˌmækˈsɪlə/ΚΠ
1880 Jrnl. Compar. Med. & Surg. 1 39 It [sc. a fungal disease of cattle] manifests itself in tumefactions of the premaxillae and the great supramaxilla.
1916 Brit. Med. Jrnl. 15 Jan. 88/1 It [sc. the bullet] had injured the base of the skull, the hard palate, and the left supramaxilla.
1933 Trans. Amer. Philos. Soc. 23 86 Maxillæ serving as levers for depression of alveolar bar of premaxilla; one supramaxilla (except in the most primitive berycoids).
2000 M. L. J. Stiassny in G. K. Ostrander Lab. Fish vi. 113 Supramaxillae have been lost numerous times among teleost lineages.
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