1700–10; under- + soil1

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World English Dictionary
undersoil (ˈʌndəˌsɔɪl)
another word for subsoil

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Settlers would stack brick upon brick of sod-about an acre's worth-until they had a home, then plant crops in the rich undersoil.
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