solum

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solum

[′sō·ləm]
(geology)
The upper part of a soil profile, composed of A and B horizons in mature soil. Also known as true soil.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

solum

The uppermost layer of soil.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.