Etymology
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ethylene (n.)

poisonous, flammable gas, 1852, from ethyl + -ene, probably suggested by methylene.

updated on September 12, 2014

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Definitions of ethylene from WordNet

ethylene (n.)
a flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic;
Synonyms: ethene
From wordnet.princeton.edu, not affiliated with etymonline.