subsoil

Etymology

sub- + soil

noun

  1. The layer of earth that is below the topsoil.
    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

verb

  1. (transitive) To turn up the subsoil of.

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