Definition of subsoil
(Entry 1 of 2)
: the stratum of weathered material that underlies the surface soil
subsoil
verb
subsoiled; subsoiling; subsoils
Definition of subsoil (Entry 2 of 2)
: to turn, break, or stir the subsoil of
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Merriam-Webster unabridged
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Time Traveler for subsoil
The first known use of subsoil was in 1775
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