Irone

noun

1. A colorless dextrorotatory oil, , the odoriferous constituent of orris-root. It boils at 144° C. under 16 millimeters pressure. Also called 3, 3, 5 -trimethylcyclohexane (l′ )-4′ -butenylone.
2. 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 α-irone, which occurs as both cis and trans stereoisomers. Called also 6-methylionone.