WordReference Random House Unabridged Dictionary of American English © 2020
bur•stone  (bûrstōn′),USA pronunciation n. 
  1. Rocksany of various siliceous rocks used for millstones.
  2. Rocksa millstone of such material.
Also,  buhrstone, burrstone. Also called  buhr, burr. 
  • bur(r)4 + stone

'burstone' also found in these entries:
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