Subsoil \Sub"soil`\, n.
The bed, or stratum, of earth which lies immediately beneath
the surface soil.
Subsoil plow, a plow having a share and standard but no
moldboard. It follows in the furrow made by an ordinary
plow, and loosens the soil to an additional depth without
bringing it to the surface. --Knight.
Source: Webster's Revised Unabridged Dictionary (1913)
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