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propane (n.)

"colorless gas occurring in petroleum," 1866, with chemical suffix -ane + prop(ionic acid) (1850), from French propionique (1847), from Greek pro "forward" (see pro-) + pion "fat" (see fat (adj.)), in reference to its being first in order of the fatty acids.

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Definitions of propane from WordNet

propane (n.)
colorless gas found in natural gas and petroleum; used as a fuel;
From wordnet.princeton.edu