the fertile, upper part of the soil.
verb (used with object)
to cover (land) with topsoil.

1860–65; top1 + soil1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
topsoil (ˈtɒpˌsɔɪl)
1.  the surface layer of soil
2.  to spread topsoil on (land)
3.  to remove the topsoil from (land)

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
topsoil   (tŏp'soil')  Pronunciation Key 
The upper portion of a soil, usually dark colored and rich in organic material. It is more or less equivalent to the upper portion of an A horizon in an ABC soil.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

topsoil definition

The thin, rich layer of soil where most nutrients for plants are found.

Note: Most of the land-based biological activity of the Earth takes place here.
Note: The loss of topsoil through erosion is a major agricultural problem.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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