cobalt.

1. A hard metallic element used in some alloys, batteries, and pigments.

2. A vivid, fairly deep blue.

Use it for

Words that belong together

• cobalt alloy
• cobalt pigment

On the page

The laboratory tested the cobalt content of the alloy.

Usage notes

Primary category: sensory / description. Forms: Usually uncountable; no ordinary plural in this sense. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: description. Commonness: moderately common.