Science Dictionary
asphalt   (ās'fôlt')  Pronunciation Key 
A thick, sticky, dark-brown mixture of petroleum tars used in paving, roofing, and waterproofing. Asphalt is produced as a byproduct in refining petroleum or is found in natural beds.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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