cobalt

C1 Topic:Materials & Substances

US /ˈkoʊbɔlt/ UK /ˈkəʊbɒlt/ See IPA manual

Freq #25784

Meanings

1

noun
the chemical element with atomic number 27, a hard silvery-blue metal used in alloys, batteries, magnets, and pigments

The battery cathode contains cobalt as well as nickel and lithium.
2

noun
a deep vivid blue color, originally associated with pigments made from cobalt compounds

The butterfly's wing flashed a stripe of intense cobalt.
3

adj
having a deep vivid blue color

Cobalt tiles formed a bright border around the fountain.

Thesaurus

Synonyms

1 noun · the chemical element with... Co

2 noun · a deep vivid blue color,... cobalt blue

3 adj · having a deep vivid blue color cobalt-bluedeep blue

Word family

Derived forms cobalticcobaltouscobaltite

Related forms element metal pigment blue

Etymology

From German Kobalt, an older form of Kobold ("goblin"). Miners blamed troublesome ores that yielded no expected metal and released poisonous arsenic fumes on underground spirits; the name later passed to the element isolated from such ores.

Topics

Materials & Substances

External links

# cobalt

**Type:** Word
**Level:** C1
**Part of speech:** noun, adj
**IPA (US):** /ˈkoʊbɔlt/
**IPA (UK):** /ˈkəʊbɒlt/
**Frequency rank:** 25784

## Meanings
1. the chemical element with atomic number 27, a hard silvery-blue metal used in alloys, batteries, magnets, and pigments
2. a deep vivid blue color, originally associated with pigments made from cobalt compounds
3. having a deep vivid blue color

## Examples
- The battery cathode contains cobalt as well as nickel and lithium.
- The butterfly's wing flashed a stripe of intense cobalt.
- Cobalt tiles formed a bright border around the fountain.

## Synonyms
- Co
- cobalt blue

## Derived Forms
- cobaltic
- cobaltous
- cobaltite

## Related Forms
- element
- metal
- pigment
- blue

## Etymology
From German Kobalt, an older form of Kobold ("goblin"). Miners blamed troublesome ores that yielded no expected metal and released poisonous arsenic fumes on underground spirits; the name later passed to the element isolated from such ores.

## Topics
- Materials & Substances

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