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.
Origin of cobaltGerman kobalt: so named (c. 1730) by Georg Brandt (1694-1768), Swedish chemist from German kobold, literally , goblin; term used for the ore by miners, who regarded it as worthless and as injurious because of its arsenic content
A hard, brittle metallic element, found associated with nickel, silver, lead, copper, and iron ores and resembling nickel and iron in appearance. It is used chiefly for magnetic alloys, high-temperature alloys, and in the form of its salts for blue glass and ceramic pigments. Atomic number 27; atomic weight 58.9332; melting point 1,495°C; boiling point 2,927°C; specific gravity 8.9; valence 2, 3. See Periodic Table.
Origin of cobaltGerman 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) ; see kobold .
- A chemical element (symbol Co) with an atomic number of 27.
- Cobalt blue.
From German Kobold (“goblin”), from Middle High German (see Kobold for more).