Valylene

Val´yl`ene


n.1.(Chem.) A volatile liquid hydrocarbon, C5H6, related to ethylene and acetylene, but possessing the property of unsaturation in the third degree. It is the only known member of a distinct series of compounds. It has a garlic odor.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.