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The upper layer of soil at a given location, usually containing significantly more organic matter than is found in lower layers.
tr.v. top·soiled, top·soil·ing, top·soils
To place topsoil on (land).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.