<p><strong>Noun</strong></p><ul><li>a medicine, allergen, or other substance that is inhaled.</li><li>any volatile substance, as nitrous oxide, butyl nitrite, toluene, gasoline, or paint thinner, capable of being inhaled, sometimes abused for its intoxicating effect.</li><li>inhaler.</li></ul><p><strong>Adjective</strong></p><ul><li>used for inhaling.</li></ul>