A bituminous waterproofing agent used in various types of roofing materials.
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Merriam-Webster Online Dictionaryasphalt (noun)
a dark bituminous substance that is found in natural beds and is also obtained as a residue in petroleum refining and that consists chiefly of hydrocarbons
an asphaltic composition used for pavements and as a waterproof cement
to cover with asphalt - pave