英语词汇“underclay”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	underclay
释义	ˈunderclay [under-¹ 5 b.] A bed of clay beneath a stratum, now spec. under a seam of coal. 1661J. Childrey Brit. Baconica 58 The rains that fall, wash by degrees the uppermost mould down into the Valleys,..but leaves the underclay behind.1840[see underclift].1845Lyell Trav. N. Amer. I. 84, I was curious to know whether the Stigmariæ would be found here in the under⁓clays.1867Smythe Coal 25 The floor, thill, or seat..of the coal is an underclay, generally good for fire-brick.
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