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[soh-luh m] /ˈsoʊ ləm/
noun, plural sola
[soh-luh] /ˈsoʊ lə/ (Show IPA),
the upper part of the soil profile, which is influenced by plant roots; the A horizon and the B horizon.
Origin of solum
1820-30; < Latin: base, bottom; see sole2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for solum


noun (pl) -lums, -la (-lə)
the upper layers of the soil profile, affected by climate and vegetation
Word Origin
C19: New Latin from Latin: the ground
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 solum

Latin, "ground, soil," of unknown origin.

Online Etymology Dictionary, © 2010 Douglas Harper
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solum in Science
Plural sola or solums
The upper layers of a soil profile in which soil formation occurs. The A and B horizons in an ABC soil are part of the solum.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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