D defs.my
Entry 1 sense Webster, 1913

Pentamethylene

· Pen·ta·meth·yl·ene · IPA
01 n. A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives; -- so named because regar…
  1. 1.
    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.(Chem.) See: Trimethylene, Tetramethylene