D defs.my
Entry 1 sense Webster, 1913

Propidene

· Pro·pi·dene · IPA
01 n. The unsymmetrical hypothetical hydrocarbon radical, CH3.CH2.CH, analogous to ethylidene, and regarded as the type of certain derivatives of…
  1. 1.
    The unsymmetrical hypothetical hydrocarbon radical, CH3.CH2.CH, analogous to ethylidene, and regarded as the type of certain derivatives of propane; -- called also propylidene.(Chem.) Also: propylidene