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noun\bə-ˈtyü-mən, bī-, -ˈtü-, especially British alsoˈbit-yə-\
Definition of BITUMEN
: an asphalt of Asia Minor used in ancient times as a cement and mortar
: any of various mixtures of hydrocarbons (as tar) often together with their nonmetallic derivatives that occur naturally or are obtained as residues after heat-refining natural substances (as petroleum); specifically: such a mixture soluble in carbon disulfide
Mixture of tarlike hydrocarbons derived from petroleum. Black or brown, it varies from viscous to solid; the solid form is usually called asphalt. Bitumen occurs in nearly every part of the world and in nearly the whole range of geologic strata. The term may also refer to synthetic hydrocarbon compounds.