eurygnathous,a.|jʊəˈrɪgnəθəs| [f.Fr.eurygnathe (f.Gr. εὐρύ-ς broad + γνάθ-ος jaw) + -ous.] Having a broad upper-jaw. 1878Bartley tr.Topinard's Anthrop. ii. i. 201 The second, a Mongolian, with the face broad, in consequence of the prominence of the cheek-bones (eurygnathous).