Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A fine-grained whetstone lubricated with oil, used for fine sharpening.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A type of stone used for sharpening objects such as knives and razorblades.

from the GNU version of the Collaborative International Dictionary of English

  • n. A variety of hone slate, or whetstone, used for whetting tools when lubricated with oil.

from The Century Dictionary and Cyclopedia

  • To rub, or sharpen or polish by rubbing, on an oilstone.
  • n. A slab of fine-grained stone used for imparting a keen edge to tools, and so called because oil is used for lubricating its rubbing-surface. Fine oilstones are often made of novaculite, a fine-grained variety of quartz.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a whetstone for use with oil

Etymologies

oil +‎ stone (Wiktionary)

Examples

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  • "'Poll, my dear, there are two coarse and two very fine oilstones on the bottom shelf of the medicine chest.'"
    --Patrick O'Brian, The Hundred Days, 56

    March 20, 2008