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Related to oilstone: whetstone
A fine-grained whetstone lubricated with oil, used for fine sharpening.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Tools) a stone with a fine grain lubricated with oil and used for sharpening cutting tools. See also whetstone
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a block of fine-grained stone, usu. oiled, for putting the final edge on certain cutting tools by abrasion.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.