Pentamethylene Pen`ta*meth"yl*ene, n. [Penta- + methylene.] (Chem.) 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}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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