underclayn.

Brit.

/ˈʌndəkleɪ/, U.S.

/ˈəndərˌkleɪ/

Etymology: under- prefix¹ 2b(b).

A bed of clay beneath a stratum, now spec. under a seam of coal.

ΘΚΠ

the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material below > below coal

thill1329

underclay1660

sloom1803

underclift1840

warrant1847

swad1860

spavin1870

undercliff1883

under-earth1883

1660 J. Childrey Britannia Baconica 58 The rains that fall, wash by degrees the uppermost mould down into the Valleys,..but leaves the underclay behind.

1840 W. Logan in Trans. Geol. Soc. 2nd Ser. VI. 491 In South Wales, immediately below every regular seam of coal,..lies a bed of clay, which is commonly called underclay, underclift, understone.

1845 C. Lyell Trav. N. Amer. I. 84 I was curious to know whether the Stigmariæ would be found here in the under~clays.

1867 W. W. Smyth Treat. Coal & Coal-mining 25 The floor, thill, or seat..of the coal is an underclay, generally good for fire-brick.

This entry has not yet been fully updated (first published 1921; most recently modified version published online March 2022).

单词	underclay
释义	underclayn. Brit. /ˈʌndəkleɪ/, U.S. /ˈəndərˌkleɪ/ Etymology: under- prefix¹ 2b(b). A bed of clay beneath a stratum, now spec. under a seam of coal. ΘΚΠ the world > the earth > minerals > mineral deposits > features of stratum or vein > [noun] > material below > below coal thill1329 underclay1660 sloom1803 underclift1840 warrant1847 swad1860 spavin1870 undercliff1883 under-earth1883 1660 J. Childrey Britannia Baconica 58 The rains that fall, wash by degrees the uppermost mould down into the Valleys,..but leaves the underclay behind. 1840 W. Logan in Trans. Geol. Soc. 2nd Ser. VI. 491 In South Wales, immediately below every regular seam of coal,..lies a bed of clay, which is commonly called underclay, underclift, understone. 1845 C. Lyell Trav. N. Amer. I. 84 I was curious to know whether the Stigmariæ would be found here in the under~clays. 1867 W. W. Smyth Treat. Coal & Coal-mining 25 The floor, thill, or seat..of the coal is an underclay, generally good for fire-brick. This entry has not yet been fully updated (first published 1921; most recently modified version published online March 2022). < n.1660
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