ˈæʃfɑlt ˈæʃfɔlt ˈæsfælt ˈæsfɔlt ˈæʃfɑlt ˈæʃfɔlt ˈæsfælt ˈæsfɔlt cover with tar or asphalt asphalt the driveway a dark bituminous substance found in natural beds and as residue from petroleum distillation; consists mainly of hydrocarbons mixed asphalt and crushed gravel or sand; used especially for paving but also for roofing