Etymology
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cadmium (n.)

bluish-white metallic element, 1822, discovered 1817 by German scientist Friedrich Strohmeyer (1776-1835), coined in Modern Latin from cadmia, a word used by ancient naturalists for various earths and oxides (especially zinc carbonate), from Greek kadmeia (ge) "Cadmean (earth)," from Kadmos "Cadmus," legendary founder of Boeotian Thebes. With metallic element ending -ium. So called because the earth was first found in the vicinity of Thebes (Kadmeioi was an alternative name for "Thebans" since the time of Homer). Its sulphate furnishes a brilliant and permanent yellow color (cadmium-yellow, 1850) used by artists, etc.

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Definitions of cadmium

cadmium (n.)
a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores;
Synonyms: Cd / atomic number "
From wordnet.princeton.edu