| 单词 | sill-coal | 
| 释义 | > as lemmassill-coal  a.  A kind of clay found in coal-measures. Also attributive, as  sill-coal,  sill-pencil. ΘΚΠ the world > the earth > structure of the earth > constituent materials > clay > 			[noun]		 > in coal measures clunch1686 soap-scale1704 sill1774 poundstone1799 clunch-clay1815 blond-metal1831 1774    Philos. Trans. 		(Royal Soc.)	 64 491  				A shining kind of stony clay, called by the miners sill, lying in large beds in coal grounds. 1841    C. H. Hartshorne Salopia Antiqua Gloss.  				Sill-coal, coal which my informant describes as being found ‘in the clunches’. 1899    E. W. Prevost Dickinson's Gloss. Words & Phrases Cumberland 		(new ed.)	  				Sill, the soft clay of the coal measures, used for slate pencils, which are called sill pencils. < as lemmas | 
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