Propidene

Pro´pi`dene

n.

1.

(Chem.) The unsymmetrical hypothetical hydrocarbon radical, CH3.CH2.CH, analogous to ethylidene, and regarded as the type of certain derivatives of propane; - called also propylidene.

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