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

  • n. The upper layers of a soil profile in which topsoil formation occurs.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes.

from The Century Dictionary and Cyclopedia

  • n. In Scots law, ground; a piece of ground.


Latin, base, ground.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin solum ("base, bottom; soil"). (Wiktionary)



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