Pro"pi*dene\, n. [Propyl + ethylidene.] (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, © 1996, 1998 MICRA, Inc.
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