Situated between the maxillary or upper jaw-bones: specifically applied to the intermaxilla or premaxilla.n. The intermaxilla or premaxilla; one of a pair of bones of the upper jaw, situated between or rather in front of the maxillary bones, and in relation with its fellow of the opposite side.n. One of the foremost pair of the upper jawbones in most teleostean fishes, once generally supposed to be homologous with the intermaxillary of the higher vertebrates.n. The intermaxillary lobe of an insect. See I.