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A bituminous material, such as asphalt, used to pave roads.
tr.v. black·topped, black·top·ping, black·tops
To pave with a bituminous material.
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.