† odontognathousadj. [ < odonto-comb. form + -gnathouscomb. form, after scientific Latin odontognathus (1800 as a specific epithet); compare French odontognathe (1859 or earlier)] ZoologyObsoleterare having tooth-like ridges on the jaw, as gastropods of the family Helicidae.Apparently only attested in dictionaries or glossaries.