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

  • n. Variant of buhrstone.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A tough, silicified limestone formerly used to make millstones. It is typified by the presence of multiple cavities that originally housed fossilized shells.

from the GNU version of the Collaborative International Dictionary of English

  • n. See buhrstone.


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