underclay
noun
: a layer of clay beneath a coal bed often containing fossil roots of coal plants and constituting fireclay
Word History
Etymology
under entry 3 + clay
| 单词 | underclay |
| 释义 | underclaynoun : a layer of clay beneath a coal bed often containing fossil roots of coal plants and constituting fireclay Word HistoryEtymology under entry 3 + clay |
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