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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.