noun Chemistry.
a colorless, flammable gas, C 3 H 8 , of the alkane series, occurring in petroleum and natural gas: used chiefly as a fuel and in organic synthesis.
Also called dimethylmethane.

1866; prop(ionic) + -ane Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
propane (ˈprəʊpeɪn)
a colourless flammable gaseous alkane found in petroleum and used as a fuel. Formula: CH3CH2CH3
[C19: from propionic acid + -ane]

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

"colorless gas occurring in petroleum," 1866, with chemical suffix -ane, from prop(ionic acid) (1850), from Fr. propionique (1847), from Gk. pro "forward + pion "fat," in reference to its being first in order of the fatty acids.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

propane pro·pane (prō'pān')
A colorless hydrocarbon found in natural gas and petroleum and widely used as a fuel.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
propane   (prō'pān')  Pronunciation Key 
A colorless, gaseous hydrocarbon found in petroleum and natural gas. It is widely used as a fuel. Propane is the third member of the alkane series. Chemical formula: C3H8.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The grill is fueled by propane, so there is no need to run a gas line.
Powered by propane or a mixture of propane and butane, these devices are not
  meant to burn weeds.
The night before someone came by with a propane grill and cooked brisket for
Other options include stoves that run on propane gas or pellets, or reflect
  solar radiation onto a cooking vessel.
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