solum

solum

[soh-luhm]
noun, plural sola [soh-luh] , solums.
the upper part of the soil profile, which is influenced by plant roots; the A horizon and the B horizon.

Origin:
1820–30; < Latin: base, bottom; see sole2

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World English Dictionary
solum (ˈsəʊləm)
 
n , pl -lums, -la
the upper layers of the soil profile, affected by climate and vegetation
 
[C19: New Latin from Latin: the ground]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Science Dictionary
solum   (sō'ləm)  Pronunciation Key 
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
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