Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun 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 Century Dictionary.

  • noun See burstone.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) A cellular, flinty rock, used for mill stones.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Alternative spelling of burrstone.

Etymologies

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

[Variant of burr + stone.]

Examples

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