Whinstone definition

wĭnstōn, hwĭn-
Any of various hard, dark-colored rocks, especially basalt and chert.
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(chiefly brit.) Any of several hard, igneous or basaltic rocks, esp. chert, occurring as dikes or flows.
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(quarrying industry) Any hard dark-coloured rock.
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Other Word Forms

Noun

Singular:
whinstone
Plural:
whinstones