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subsoil

[suhb-soil] /ˈsʌbˌsɔɪl/
noun
1.
the bed or stratum of earth or earthy material immediately under the surface soil.
Also called undersoil.
Origin
1790-1800
1790-1800; sub- + soil1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for subsoil
  • The upper part of the subsoil is dominantly brownish-yellow.
  • The upper part of the subsoil is brownish-yellow, friable silt loam mottled with light gray.
British Dictionary definitions for subsoil

subsoil

/ˈsʌbˌsɔɪl/
noun
1.
  1. Also called undersoil. the layer of soil beneath the surface soil and overlying the bedrock
  2. (as modifier): a subsoil plough
verb
2.
(transitive) to plough (land) to a depth below the normal ploughing level and so break up the subsoil
Derived Forms
subsoiler, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for subsoil
n.

1799, from sub- + soil (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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subsoil in Science
subsoil
  (sŭb'soil')   
In an ABC soil, the B horizon. The term was formerly used to mean the layer of earth below the humus or surface soil.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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