One of the mysteries of the English language finally explained.
A fine-grained flat stone used with oil for sharpening cutting edges.
- ‘This can be done by rubbing away surplus metal with a grindstone, whetstone, oilstone, steel, ceramic rod, leather strop or the palm of your hand.’
- ‘He's currently sharpening one of his chisels at the oilstone in the corner of the room.’
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