Hypertext Webster Gateway: "undersoil"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Undersoil \Un"der*soil`\, n.
The soil beneath the surface; understratum; subsoil.
From WordNet (r) 1.7 (wn)
undersoil
n : the layer of soil between the topsoil and bedrock [syn: {subsoil}]
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