Hard siliceous rock suitable for making millstones; spec. (frequently Millstone Grit) a coarse sandstone of the British Carboniferous, lying…
| 单词 | θ5668 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > gritstone (3) millstone grit1682 Hard siliceous rock suitable for making millstones; spec. (frequently Millstone Grit) a coarse sandstone of the British Carboniferous, lying… galliard1781 A hard, smooth, siliceous stone or rock; esp. a flinty gritstone. ganister1811 A close-grained siliceous stone from the lower coal-measures in Yorkshire, ground down to form furnace-hearths, etc. (See also quot. 1881.) Also… |
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