• (a.) Long-jawed.
Mac`rog·nath'ic adjective [ Macro- + gnathic .] (Anthropol.) Long-jawed. Huxley. 
macrognathia, macrognathic An abnormally large jaw. This condition is associated with pituitary gigantism, tumors, and other disorders. Macrognathia can often be corrected with surgery. Also called prognathic mandible.