English regional (Somerset). A stratum of argillaceous slate lying between coal seams. Now rare.
| 单词 | θ6286 |
| 释义 | the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material above or between (1) cleft1676 English regional (Somerset). A stratum of argillaceous slate lying between coal seams. Now rare. |
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