Propidene
Pronunciation : Pro"pi*dene
Part of Speech : n.
Etymology : [Propyl + ethylidene.] (Chem.)
Definition : Defn: The unsymmetrical hypothetical hydrocarbon radical, CH3.CH2.CH, analogous to ethylidene, and regarded as the type of certain derivatives of propane; -- called also propylidene.
Source : Webster's Unabridged Dictionary, 1913