Any of various green inorganic pigments obtained by doping cobalt(II) oxide into colorless host oxides.

(inorganic chemistry) Any ammine of cobalt, especially the hexamminecobalt(III) cation

(biochemistry) Alternative spelling of cobalamin

A nuclear bomb that includes cobalt; this will absorb neutrons and become radioactive cobalt-60.

A chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal. / Cobalt blue.

A deep blue pigment derived from cobalt; zaffre.

Of the color of the pigment zaffre.

(chemistry) Of or relating to cobalt. / (chemistry) Containing cobalt in oxidation state 3.

(chemistry) cobaltic

(chemistry) A corrinoid.