[as-fawlt or, esp. British, -falt]
any of various dark-colored, solid, bituminous substances, native in various areas of the earth and composed mainly of hydrocarbon mixtures.
a similar substance that is the by-product of petroleum-cracking operations.
a mixture of such substances with gravel, crushed rock, or the like, used for paving.
verb (used with object)
to cover or pave with asphalt.
of, pertaining to, or containing asphalt: asphalt tile.

1275–1325; earlier asphaltos, -um < Latin < Greek ásphaltos, -on, akin to asphalízein to make firm, to secure; replacing Middle English aspaltounGreek ásphalton

asphaltic, adjective
asphaltlike, adjective
unasphalted, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
asphalt (ˈæsfælt, ˈæʃ-, -fɔːlt)
1.  any of several black semisolid substances composed of bitumen and inert mineral matter. They occur naturally in parts of America and as a residue from petroleum distillation: used as a waterproofing material and in paints, dielectrics, and fungicides
2.  a mixture of this substance with gravel, used in road-surfacing and roofing materials
3.  (modifier) containing or surfaced with asphalt
4.  (tr) to cover with asphalt
[C14: from Late Latin aspaltus, from Greek asphaltos, probably from a-1 + sphallein to cause to fall; referring to its use as a binding agent]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 14c., "resinous mineral pitch found in Biblical lands," from L.L. asphaltum, from Gk. asphaltos, probably from a non-Gk. source, possibly Semitic. Meaning "paving composition" dates from 1847.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
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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Example sentences
For his part, the mayor says asphalt pavements are more expensive to maintain
  than brick.
With the concave shape of the asphalt lanes, the path of the ball can be
Also use roofing nails to attach asphalt shingles, working up from the roof's
  bottom end.
Roads have the same asphalt and gully covers as decades ago.
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