The thin stratum of fire-clay, etc. usually underlying a coal-seam; underclay; the floor or bottom of a seam of coal.
| 单词 | θ6294 |
| 释义 | the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material below > below coal (9) thill1329 The thin stratum of fire-clay, etc. usually underlying a coal-seam; underclay; the floor or bottom of a seam of coal. underclay1660 A bed of clay beneath a stratum, now spec. under a seam of coal. sloom1803 (See quots.) underclift1840 (under-, prefix1 affix 2b(b).) warrant1847 Under-clay. swad1860 A layer of stone or worthless coal at the bottom of a seam. spavin1870 (See quots.) undercliff1883 (See quot. 1883 and underclift, n.) under-earth1883 Mining. (See quot. 1883.) |
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