1. east-northeast.


  1. a suffix used to form names of unsaturated hydrocarbons (anthracene; benzene), especially those of the alkene series (butylene).

symbol for

  1. east-northeast

n combining form

  1. (in chemistry) indicating an unsaturated compound containing double bondsbenzene; ethylene

hydrocarbon suffix, from Greek name-forming suffic -ene; it has no real meaning in itself; probably abstracted mid-19c. from methylene (1834). Put in systematic use by Hofmann (1865). “The breakdown of methylene into methyl and -ene, and the identification of the last syllable of methyl with the general suffix -ly, led to the use of meth- as a separate combining-element, as, for example, in methane, methacrylic [Flood].


  1. An unsaturated organic compound, especially one containing a double bond between carbon atoms:ethylene.

  1. A suffix used to form the names of hydrocarbons having one or more double bonds, such as benzene.
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