Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of methenyl is as below...

Methenyl :: Methenyl (n.) The hypothetical hydrocarbon radical CH, regarded as an essential residue of certain organic compounds..

Mes- :: Mes- () denoting a type of hydrocarbons which are regarded as methenyl derivatives. Also used adjectively.

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