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

  • 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 Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Alternative spelling of burrstone.

from the GNU version of the Collaborative International Dictionary of English

  • n. A cellular, flinty rock, used for mill stones.

from The Century Dictionary and Cyclopedia

  • n. See burstone.


Variant of burr1 + stone.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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