eth·yl·ene 
(ĕthə-lēn′)
(ĕthə-lēn′)n.
A colorless flammable gas, C2H4, derived from natural gas and petroleum and also occurring as a natural plant hormone, used as a source of many organic compounds, in welding and cutting metals, to ripen citrus fruits, and as an anesthetic. Also called ethene.
eth′yl·enic (-ə-lēnĭk, -lĕnĭk) adj.
- histoplasmosis
- historian
- historiated
- historic
- historical
- historical linguistics
- historically
- historical materialism
- historicalness
- historical novel
- historical present
- historicism
- historicist
- historicity
- historicization
- historicize
- historied
- historiographer
- historiographic
- historiographical
- historiographically
- historiography
- history
- histrionic
- histrionical