maxillary UK /makˈsɪl.ə.ɹi/US /ˈmæk.səˌlɛɹ.i/adjective 2noun 1forms 1 adjective2 •Of or relating to the jaw or jawbone. •Of or pertaining to the maxillae of an arthropod. noun1 •A tooth growing from the upper jawbone.A tendon extends from the inner surface of the dentary to the postero-lateral surface of the maxillary near the ball and socket joint. — 1928 formsmaxillaries