Definitions

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • 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.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

proto- +‎ sulphide

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