Chem. [f. ALLYL + -ENE.] A divalent hydro-carbon radical, C3H4, isomeric with acetylene; consisting of allyl minus one atom of hydrogen. Also called propine.
1863. Watts, Dict. Chem., I. 112. Pure allylene, a colourless gas, having an unpleasant odour, burning with a smoky flame.
1869. Roscoe, Elem. Chem., 391. Allylene is formed by the action of potash upon propylene dichloride.
