'asphalt' definitions:

Definition of 'asphalt'

From: WordNet
noun
Mixed asphalt and crushed gravel or sand; used especially for paving but also for roofing
noun
A dark bituminous substance found in natural beds and as residue from petroleum distillation; consists mainly of hydrocarbons [syn: asphalt, mineral pitch]
verb
Cover with tar or asphalt; "asphalt the driveway"

Synonyms of 'asphalt'

From: Moby Thesaurus