n. Chem. a silvery-white magnetic metallic element occurring naturally as a mineral in combination with sulphur and arsenic, and used in many alloys.
Usage:
Symb.: Co.
Phrases and idioms:
cobalt blue
1. a pigment containing a cobalt salt.
2 the deep-blue colour of this.
Derivatives:
cobaltic adj. cobaltous adj.
Etymology: G Kobalt etc., prob. KOBOLD in mines