irone \i"rone\, irones \i"rones\, n. A fragrant liquid substance, a mixture of several isomers of the formula {C14H22O}, forming the essence of the violet fragrance, commonly isolated from orris oil or from the rhizomes of Iris. The main ingredient in violets is {[alpha]-irone}, which occurs as both cis and trans stereoisomers. Called also {6-methylionone}. [PJC]