/in hay"leuhnt/ , n.
1. a medicine, allergen, or other substance that is inhaled.
2. any volatile substance, as nitrous oxide, butyl nitrite, toluene, gasoline, or paint thinner, capable of being inhaled, sometimes abused for its intoxicating effect.
3. inhaler.
adj.
4. used for inhaling.
[ 1815-25; INHALE + -ANT ]