whinstoneEtymologyPossibly corrupted from quern stone, i.e. stone suitable for making querns; or else, from whin + stone.whinstone means A stone used to crush whin for use as winter feed for cattle. Lexicurio rates it Sui generis — a strength score of 89 out of 100.nounA stone used to crush whin for use as winter feed for cattle.Any hard dark-coloured rock.“‘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.’”