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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Example sentences
Fill the drainage holes thus created with good-quality topsoil.
Quick renovation kept topsoil and runoff out of the creek that forms the
  house's rear property line.
If its authors have identified these correctly, it fits in well with an overall
  picture showing loss of forests and topsoil.
McKay fruitlessly looked for cyanobacteria and organic molecules in the topsoil
  and underground.
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