Relating to or containing ethene (ethylene), especially describing compounds that have the characteristic double bond of ethene.
From ethene + -ic (adjective suffix). This systematic formation allows chemists to describe compounds based on their structural relationship to ethene.
The word 'ethenic' is less common than 'ethylenic,' but it shows how organic chemistry creates adjectives to describe molecular families—if something is 'ethenic,' it contains the double-bond signature of ethene.
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