Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: cealc, from Latin calx ' LIME12', from Greek chalix 'small stone'

chalk

1 noun
     
Related topics: Visual, Geology
chalk1 [uncountable]
1HEG soft white or grey rock formed a long time ago from the shells of small sea animals [= limestone]:
chalk cliffs
2 also chalks [plural]AV small sticks of a white or coloured substance like soft rock, used for writing or drawing:
a box of coloured chalks
a piece of chalk
writing in chalk on the blackboard
3

chalk and cheese

British English completely different from each other:
They're like chalk and cheese, those two.

➔ long chalk

at long1 (21)

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