the bed or stratum of earth or earthy material immediately under the surface soil.
Also called undersoil.

1790–1800; sub- + soil1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subsoil (ˈsʌbˌsɔɪl)
1.  a.  Also called: undersoil the layer of soil beneath the surface soil and overlying the bedrock
 b.  (as modifier): a subsoil plough
2.  (tr) to plough (land) to a depth below the normal ploughing level and so break up the subsoil

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1799, from sub- + soil (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
subsoil   (sŭb'soil')  Pronunciation Key 
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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Example sentences
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.
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