Coal that is harder than some other kinds and not readily split; spec. coal of a higher rank (rank, n.1 10) than lignite, esp. anthracite.
| 单词 | θ6583 |
| 释义 | the world > the earth > minerals > types of mineral > hydrocarbon minerals > [noun] > coal > hard coal (4) hard coal1653 Coal that is harder than some other kinds and not readily split; spec. coal of a higher rank (rank, n.1 10) than lignite, esp. anthracite. stone-coal1708 Any hard variety of coal, esp. anthracite. flint-coal1841 (see quot.). durain1919 A type of hard, compact coal forming a dull layer in a bituminous seam. |
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