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NET Glossary: a naturally occurring asphalt (especially of Asia Minor) used in ancient times as a cement and mortar
Bitumen [nave]
BITUMEN, See: Tar.Bitumen [ebd]
Gen. 11:3, R.V., margin, rendered in the A.V. "slime"), a mineral pitch. With this the ark was pitched (6:14. See also Ex. 2:3.) (See SLIME.)
Also see definition of "Bitumen" in Word Study