petroleous

petroleum

[puh-troh-lee-uhm]
noun
an oily, thick, flammable, usually dark-colored liquid that is a form of bitumen or a mixture of various hydrocarbons, occurring naturally in various parts of the world and commonly obtained by drilling: used in a natural or refined state as fuel, or separated by distillation into gasoline, naphtha, benzene, kerosene, paraffin, etc.

Origin:
1520–30; < Medieval Latin: literally, rock oil, equivalent to Latin petr(a) rock (< Greek pétra) + oleum oil

petroleous, adjective
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World English Dictionary
petroleum (pəˈtrəʊlɪəm)
 
n
a dark-coloured thick flammable crude oil occurring in sedimentary rocks around the Persian Gulf, in parts of North and South America, and below the North Sea, consisting mainly of hydrocarbons. Fractional distillation separates the crude oil into petrol, paraffin, diesel oil, lubricating oil, etc. Fuel oil, paraffin wax, asphalt, and carbon black are extracted from the residue
 
[C16: from Medieval Latin, from Latin petra stone + oleum oil]

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

petroleum
1348, from M.L. petroleum, from L. petra "rock" + oleum "oil."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
petroleum   (pə-trō'lē-əm)  Pronunciation Key 
A thick, flammable, yellow-to-black mixture of gaseous, liquid, and solid hydrocarbons that occurs naturally beneath the Earth's surface. It can be separated into fractions including natural gas, gasoline, naphtha, kerosene, paraffin wax, asphalt, and fuel and lubricating oils, and is used as raw material for a wide variety of derivative products. It is believed to originate from the accumulated remains of fossil plants and animals, especially in shallow marine environments.
The American Heritage® Science Dictionary
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