a yellowish, fragrant, flammable liquid, C5H11NO2, used in medicine chiefly as a vasodilator, esp. in the treatment of angina pectoris: misused by inhalation as a stimulant, esp. of sexual sensation. Also called isoamyl nitrite.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.