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 pentamethylene is as below...

Pentamethylene :: Pentamethylene (n.) A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives; -- so named because regarded as composed of five methylene residues. Cf. Trimethylene, and Tetramethylene..

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