ketineChem.|ˈkiːtaɪn| [f. ketone + -ine5.] An oily liquid, C6H8N2, or one of a series of homologous bases CnH2n-4N2 formed by the reduction of nitrosoacetone and its homologues by sodium (or tin) and hydrochloric acid. 1892Morley & Muir Watts' Dict.Chem. III. 101.