Dictionary![]() ![]() bur•stonePronunciation: (bûr'stōn"), [key] —n. 1. any of various siliceous rocks used for millstones. 2. a millstone of such material. Also,buhrstone,burrstone.Also called buhr, burr. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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