butyl nitrite

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A colorless, volatile liquid butyl ester of nitrous acid, C₄H₉NO₂, included as an ingredient in some household room deodorizers and used illicitly to induce euphoria and enhance sexual stimulation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a colorless pungent liquid sometimes used as a stimulant drug by drug abusers