Cobalt Definition
kōbôlt
noun
A hard, lustrous, steel-gray, ductile, metallic chemical element, found in various ores: it is used in the preparation of magnetic, wear-resistant, and high-strength alloys: its compounds are used in the production of inks, paints, and varnishes: symbol, Co; at. no. 27: a radioactive isotope (cobalt-60) is used in the treatment of cancer, in research, etc.
Webster's New World
A radioactive isotope of cobalt with mass number 60 and exceptionally intense gamma-ray activity, used in radiotherapy, metallurgy, and materials testing.
American Heritage
A chemical element (symbol Co) with an atomic number of 27.
Wiktionary
Cobalt blue.
Wiktionary
Origin of Cobalt
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German Kobalt from Middle High German kobolt variant of kobold goblin (from silver miners' belief that cobalt had been placed by goblins who had stolen the silver) kobold
From American Heritage Dictionary of the English Language, 5th Edition
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From German Kobold (“goblin”), from Middle High German (see Kobold for more).
From Wiktionary
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