cobalt oxide

noun

: an oxide of cobalt: such as

a

: the monoxide CoO obtained usually as a grayish powder

called also cobaltous oxide

b

: a gray to blue-black powder containing cobalt monoxide and higher oxides (as tricobalt tetroxide Co₃O₄) and used chiefly in coloring glass and ceramic ware blue

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now