sub·max·il·lar·y 
(sŭb-măksə-lĕr′ē)
(sŭb-măksə-lĕr′ē)adj.
1. Of or relating to the lower jaw: a submaxillary fracture.
2. Situated beneath the maxilla: the submaxillary salivary glands.
n. pl. sub·max·il·lar·ies
An anatomical part, such as a gland or nerve, that is situated beneath the maxilla.