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penta- +‎ methylene, being composed of five methylene residues.


pentamethylene (plural pentamethylenes)

  1. (organic chemistry) A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives.

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Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.