Etymology
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bitumen (n.)

mid-15c., from Latin bitumen "asphalt, mineral pitch," probably, via Oscan or Umbrian, from Celtic *betu- "birch, birch resin" (compare Gaulish betulla "birch," used by Pliny for the tree supposedly the source of bitumen). Related: Bituminate.

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Definitions of bitumen

bitumen (n.)
any of various naturally occurring impure mixtures of hydrocarbons;
From wordnet.princeton.edu