from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The layer or bed of earth beneath the topsoil.
  • transitive v. To plow or turn up the subsoil of.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The layer of earth that is below the topsoil.

from the GNU version of the Collaborative International Dictionary of English

  • n. The bed, or stratum, of earth which lies immediately beneath the surface soil.
  • transitive v. To turn up the subsoil of.

from The Century Dictionary and Cyclopedia

  • n. The under-soil: the bed or stratum of earth or earthy matter which lies immediately under the surface soil, and which is less finely disintegrated and contains less organic matter than that.
  • In agriculture, to employ the subsoil-plow upon; plow up so as to cut into the subsoil.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the layer of soil between the topsoil and bedrock


sub- +‎ soil (Wiktionary)



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