smelling salts

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

• noun plural Any of various preparations of ammonium carbonate and perfume, sniffed as a restorative or stimulant especially to relieve faintness and headache.

from The Century Dictionary.

• A preparation of ammonium carbonate with some agreeable scent, as lavender or bergamot, used as a stimulant and restorative in faintness and for the relief of headache.

from the GNU version of the Collaborative International Dictionary of English.

• An aromatic preparation of carbonate of ammonia and, often, some scent, to avoid or relieve faintness, headache, or the like.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Plural form of smelling salt.
• noun ammonium carbonate, sometimes with added perfume, that is sniffed as a mild stimulant and to relieve fainting

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

• noun a pungent preparation of ammonium carbonate and perfume; sniffed as a stimulant to relieve faintness