Dictionary

1subsoil

noun sub·soil \ˈsəb-ˌsi(-ə)l\

: the layer of soil that is under the top layer

Full Definition of SUBSOIL

:  the stratum of weathered material that underlies the surface soil

First Known Use of SUBSOIL

1796

2subsoil

transitive verb

Definition of SUBSOIL

:  to turn, break, or stir the subsoil of
sub·soil·er noun

First Known Use of SUBSOIL

1840

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