| 单词 | millstone grit |
| 释义 | millstone gritnoun [mass noun] 1A coarse sandstone of the British Carboniferous, occurring immediately below the coal measures.This school is built on rock, millstone grit, alongside carboniferous limestone....
1.1Any hard siliceous rock suitable for making millstones.About a mile below Grayson, the millstone grit is seen on Barrett's creek....
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