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usually uncountable, plural whinstones
A stone used to crush whin for use as winter feed for cattle. examples
(quarrying industry) Any hard dark-coloured rock. quotations examples
‘A rough fellow, rather, Mrs. Dean. Is not that his character?‘ ‘Rough as a saw-edge, and hard as whinstone! The less you meddle with him the better.’
1847, Emily Brontë, chapter IV, in Wuthering Heights