| 单词 | top-hard |
| 释义 | > as lemmastop-hard top-hard n. (also top-hard coal) see quot. 1855, and cf. top coal n. ⓘ ΘΚΠ the world > the earth > minerals > mineral deposits > [noun] > stratum or bed > of coal > type of coal seam foot coal1665 foot-rid1665 top coal1803 ten-yard coal1839 rider1840 ten-foot coal1855 top-hard1855 yard-coal1855 yard-seam1862 guide seam1867 main1867 bank1881 rearer1883 thick coal1883 thick seam1883 thin seam1883 1855 J. Phillips Man. Geol. 190 The thickest coal in the district, called the ‘top hard’, is the same bed as that called the thick or ten-foot coal in Yorkshire. 1867 W. W. Smyth Treat. Coal & Coal-mining 56 Cutting the top-hard coal at 510 yards deep. < as lemmas |
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