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countable and uncountable, plural subsoils
The layer of earth that is below the topsoil. quotations examples
In the few areas underlain by horizontally bedded limestone, the surface soil is dark gray to black and peatlike, and the subsoil gray and marllike.
1954, Soil survey of Wise County, Virginia, page 28
third-person singular simple present subsoils, present participle subsoiling, simple past and past participle subsoiled
(transitive) To turn up the subsoil of. examples