cobalt

22 ENTRIES FOUND:

co·balt

noun \ˈkō-ˌblt\

: a hard, shiny, silver-white metal that is often mixed with other metals

Full Definition of COBALT

1
:  a tough lustrous silver-white magnetic metallic element that is related to and occurs with iron and nickel and is used especially in alloys — see element table
2
:  cobalt blue 2

Origin of COBALT

German Kobalt, alteration of Kobold, literally, goblin, from Middle High German kobolt; from its occurrence in silver ore, believed to be due to goblins
First Known Use: 1683

co·balt

noun \ˈkō-ˌblt\   (Medical Dictionary)

Medical Definition of COBALT

: a tough lustrous silver-white magnetic metallic element that is related to and occurs with iron and nickel and is used especially in alloys—symbol Co; see element table

cobalt

noun    (Concise Encyclopedia)

Metallic chemical element, one of the transition elements, chemical symbol Co, atomic number 27. Widely dispersed in small amounts in many minerals and ores, this magnetic, silvery white metal with a faint bluish tinge is used mostly for special alloys (e.g., alnico, tool steel) with exacting applications. At valence 2 or 3 it forms numerous coordination complexes. One is vitamin B (cyanocobalamin; see vitamin B complex). Cobalt and its compounds are used in electroplating and colouring ceramics and glass and as lamp filaments, catalysts, a trace element in fertilizers, and paint and varnish driers. The pigment cobalt blue has a variable composition, roughly that of cobalt oxide plus alumina. A radioactive isotope of cobalt emits penetrating gamma rays that are used in radiation therapy.

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