oilstone

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oilstone:

see whetstonewhetstone,
natural or manufactured stone used as an abrasive solid to sharpen tools. It is used dry, with water, or with oil. Such a stone of the finer grade used with oil is usually called an oilstone.
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oilstone

[′ȯil‚stōn]
(materials)
A whetstone used with oil.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

oilstone

A fine-grained stone used to impart a sharp edge on tools; oil is used to lubricate the rubbing surface.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.