[bahy-too-muhn, -tyoo-, bi-, bich-oo-]
any of various natural substances, as asphalt, maltha, or gilsonite, consisting mainly of hydrocarbons.
(formerly) an asphalt of Asia Minor used as cement and mortar.

1425–75; late Middle English bithumen < Latin bitūmen

bituminoid [bahy-too-muh-noid, -tyoo-, bi-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bitumen (ˈbɪtjʊmɪn)
1.  any of various viscous or solid impure mixtures of hydrocarbons that occur naturally in asphalt, tar, mineral waxes, etc: used as a road surfacing and roofing material
2.  the constituents of coal that can be extracted by an organic solvent
3.  any liquid suitable for coating aggregates
4.  the bitumen
 a.  informal (Austral), (NZ) any road with a bitumen surface
 b.  informal (Austral) (capital) the road in the Northern Territory between Darwin and Alice Springs
5.  a transparent brown pigment or glaze made from asphalt
[C15: from Latin bitūmen, perhaps of Celtic origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

mid-15c., from L. bitumen "asphalt," probably, via Oscan or Umbrian, from Celtic *betu- "birch, birch resin" (cf. Gaulish betulla "birch," used by Pliny for the tree supposedly the source of bitumen).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
bitumen   (bĭ-t'mən)  Pronunciation Key 
Any of various flammable mixtures of hydrocarbons and other substances found in asphalt and tar. Bitumens occur naturally or are produced from petroleum and coal.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Bible Dictionary

Bitumen definition

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.)

Easton's 1897 Bible Dictionary
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