olefiant gas

[oh-luh-fahy-uhnt, oh-lee-fee-, oh-lef-ee-]

o·le·fi·ant gas

[oh-luh-fahy-uhnt, oh-lee-fee-, oh-lef-ee-]
noun
ethylene (def. 2).

Origin:
1800–10; part translation of French gaz oléfiant, equivalent to olé- (< Latin oleum oil) + -fiant, present participle of -fier -fy; see -ant
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Olefiant gas has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
(used as a nonsense word by children to express approval or to represent the longest word in English.)
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
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