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From The Collaborative International Dictionary of English v.0.48:
Cadmium \Cad"mi*um\, n. [NL. See Cadmia.] (Chem.) A comparatively rare element related to zinc, and occurring in some zinc ores. It is a white metal, both ductile and malleable. Symbol Cd. Atomic weight 111.8. It was discovered by Stromeyer in 1817, who named it from its association with zinc or zinc ore. [1913 Webster] Cadmium yellow, a compound of cadmium and sulphur, of an intense yellow color, used as a pigment. [1913 Webster]