sulfide

noun3

1. •
   Any compound of sulfur and a metal or other electropositive element or group.
2. •
   (organosulfide) A class of organic compounds RSR', where R and R' represent an alkyl group or other organic substituent.
3. •
   A kind of clear marble with a small statuette or figure inside.

   • Rare marbles, especially overlays, sulphides, clambroths, and other unusual specimens, need gentle washing and drying. — 1997