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Definition of Protosulphide
1. n. 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.
Definition of Protosulphide
1. Noun. (chemistry) That one of a series of sulphides of any element which has the lowest proportion of sulphur; a sulphide with only one atom of sulphur in the molecule. ¹
¹ Source: wiktionary.com