A small town in Mexico, formerly a Mayan city. / A surname.

plural of Coba

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) cobaltous

(chemistry) Containing cobalt in oxidation state 2.

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

(chemistry) cobaltic

(chemistry) A corrinoid.