Definition of bitumen
1
: an asphalt of Asia Minor used in ancient times as a cement and mortar
2
: any of various mixtures of hydrocarbons (such as tar) often together with their nonmetallic derivatives that occur naturally or are obtained as residues after heat-refining natural substances (such as petroleum)
specifically
: such a mixture soluble in carbon disulfide
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Merriam-Webster unabridged
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Time Traveler for bitumen
The first known use of bitumen was in the 15th century
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