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.