Source : Webster's Revised Unabridged Dictionary (1913)

Ethene \Eth"ene\, n. (Chem.)
   Ethylene; olefiant gas.

Source : WordNet®

ethene
     n : a flammable colorless gaseous alkene; obtained from
         petroleum and natural gas and used in manufacturing many
         other chemicals; sometimes used as an anesthetic [syn: {ethylene}]