[ suhb-soil ]
/ ˈsʌbˌsɔɪl /


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

Origin of subsoil

First recorded in 1790–1800; sub- + soil1
Also called undersoil. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for subsoil

British Dictionary definitions for subsoil

/ (ˈsʌbˌsɔɪl) /


  1. Also called: undersoil the layer of soil beneath the surface soil and overlying the bedrock
  2. (as modifier)a subsoil plough


(tr) to plough (land) to a depth below the normal ploughing level and so break up the subsoil

Derived forms of subsoil

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

Science definitions for subsoil

[ sŭbsoil′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.