a stratum or layer of coal.
| 单词 | θ6335 |
| 释义 | the world > the earth > minerals > mineral deposits > [noun] > stratum or bed > of coal (31) coal bed1591 a stratum or layer of coal. roach1653 British regional. Mining. A seam or bed. Also roach of coal. Obsolete. coal measure1665 Geology. Chiefly in plural. Originally: a layer, bed, or stratum of coal. In later use (in plural, frequently with capital initials): a series of… coal vein1665 main coal1708 (a) a main or principal seam of coal; (b) coal extracted from a main seam, of recognized good quality. coal seam1756 a stratum of coal; cf. seam, n.1 5. Subcategories:— horizontal course (2) — type of coal seam (16) — seam of specific coal (2) — part of coal seam (5) |
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