protosulphide
n. மிகக் குறைந்த அளவான கந்தகங்கலந்த சேர்மவகை.
Pro`to*sul"phide, n. Etym: [Proto- + sulphide.] (Chem.) Defn: That one of a series of sulphides of any element which has the lowest proportion of sulphur; a sulphide with but one atom of sulphur in the molecule.