10. 
    petroleum
    Rock oil, mineral oil, or natural oil, a dark brown or greenish inflammable liquid, which, at certain points, exists in the upper strata of the earth, from whence it is pumped, or forced by pressure of the gas attending it. It consists of a complex mixture of various hydrocarbons, largely of the met...
    Found op http://www.mondofacto.com/facts/dictionary?petroleum
    
    
11. 
    petroleum
    crude oil noun a dark oil consisting mainly of hydrocarbons
    Found op http://wordnetweb.princeton.edu/perl/webwn?s=petroleum
    
    
12. 
    petroleum
    (pә-tro´le-әm) a thick natural oil obtained from beneath the earth. It consists of a mixture of various hydrocarbons of the paraffin and olefin series.
    Found op http://www.encyclo.co.uk/local/21001
    
    
13. 
    Petroleum
    • (n.) Rock oil, mineral oil, or natural oil, a dark brown or greenish inflammable liquid, which, at certain points, exists in the upper strata of the earth, from whence it is pumped, or forced by pressure of the gas attending it. It consists of a complex mixture of various hydrocarbons, largel...
    Found op http://thinkexist.com/dictionary/meaning/petroleum/
    
    
14. 
    petroleum
    complex mixture of hydrocarbons that occur in the Earth in liquid, gaseous, or solid forms. The term is often restricted to the liquid form, commonly ... [277 related articles]
    Found op http://www.britannica.com/eb/a-z/p/51
    
    
15. 
    petroleum
    petroleum A naturally occurring liquid mixture of complex hydrocarbon compounds that yields combustible fuels, petrochemicals, and lubricants upon distillation; usually found in deposits beneath the earth's surface and thought to have originated from plant and animal remains of the geologic past. It...
    Found op http://www.wordinfo.info/words/index/info/view_unit/1457/3
    
    
16. 
    Petroleum
    A generic term applied to oil and oil products in all forms, such as crude oil, lease condensate, unfinished oils, petroleum products, natural gas plant liquids, and non-hydrocarbon compounds blended into finished petroleum products. See crude oil.
    Found op http://www.encyclo.co.uk/visitor-contributions.php
    
    
17. 
    Petroleum
    Petroleum (L. petroleum, from petra (rock) + oleum (oil)) or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights and other liquid organic compounds, that are found in geologic formations beneath the Earth`s surface. A fos...
    Found op http://en.wikipedia.org/wiki/Petroleum
    
    
18. 
    petroleum
    A naturally-occurring mixture of hydrocarbons, usually liquid 'crude oil,' but sometimes taken to include natural gas. Petroleum is believed to be formed from organic debris, chiefly of plankton and simple plants, which has been rapidly buried under marine conditions unfavorable to oxidation. After ...
    Found op http://www.daviddarling.info/encyclopedia/P/petroleum.html
    
    
19. 
    petroleum
    petroleum, oily, flammable liquid that occurs naturally in deposits, usually beneath the surface of the earth; it is also called crude oil. It consists principally of a mixture of hydrocarbons, with traces of various nitrogenous and sulfurous compounds.Sections in this article:IntroductionOrigin and...
    Found op http://www.infoplease.com/ce6/sci/A0838640.html
    
    
20. 
    Petroleum
    Petroleum is an oily, thick, flammable, usually dark coloured liquid that is a form of bitumen or a mixture of various hydrocarbons, occurring naturally in various parts of the world and often separated by distillation into petrol, naphtha, benzene, kerosene and paraffin.
    Found op http://www.probertencyclopaedia.com/browse/GP.HTM
    
    
21. 
    Petroleum
    Petroleum is a mineral oil from which petrol is derived.
    Found op http://www.probertencyclopaedia.com/browse/HP.HTM
    
    
22. 
    petroleum
    Type: Term Pronunciation: pĕ-trō′lē-ŭm Definitions: 1. A mixture of liquid hydrocarbons found in the earth in various parts of the world and believed to be derived from fossilized animal and plant remains; the source of petrolatum, in addition to its use for lighting and he...
    Found op http://www.medilexicon.com/medicaldictionary.php?t=67553
    
    

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