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pentamethylene 戊撐; 環戊烷 戊撐; 環戊烷 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]
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