A siliceous rock of coarse cellular texture, found chiefly in France and North America, and used for millstones; a piece of this rock.
| 单词 | θ5667 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > burr (2) burr-stone1690 A siliceous rock of coarse cellular texture, found chiefly in France and North America, and used for millstones; a piece of this rock. burr1721 Siliceous rock capable of being employed for millstones. |
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