Asphalt : a dark bituminous substance found in natural beds and as residue from petroleum distillation and consisting mainly of hydrocarbons; mixed asphalt and crushed gravel or sand; used especially for paving but also for roofing. Tar: A dark, oily, viscous material, consisting mainly of hydrocarbons, produced by the destructive distillation of organic substances such as wood, coal, or peat. Tarmac : a paved surface having compressed layers of broken rocks held together with tar; a paving material of tar and broken stone; mixed in a factory and shaped during paving.
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