1. The act of drawing in the breath. SYN: inspiration. 2. Drawing a medicated vapor in with the breath. 3. A solution of a drug or combination of drugs for administration as a nebulized mist intended to reach the respiratory tree. [L. in-halo, pp. -halatus, to breathe at or in]
- solvent i. i. of volatile organic solvents used in glue, nail polish remover, lacquer thinners, cleaning fluid, lighter fluid, and gasoline, for the purpose of self-intoxication. SEE ALSO: glue-sniffing.

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in·ha·la·tion .in-(h)ə-'lā-shən, .in-əl-'ā- n
1) the act or an instance of inhaling specif the action of drawing air into the lungs by means of a complex of essentially reflex actions that involve changes in the diaphragm and in muscles of the abdomen and thorax which cause enlargement of the chest cavity and lungs resulting in production of relatively negative pressure within the lungs so that air flows in until the pressure is restored to equality with that of the atmosphere
2) material (as medication) to be taken in by inhaling
in·ha·la·tion·al -shnəl, -shən-əl adj

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1. (inspiration) the act of breathing air into the lungs through the mouth and nose. See breathing.
2. a gas, vapour, or aerosol breathed in for the treatment of conditions of the respiratory tract.
inhaler n.

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in·ha·la·tion (in″hə-laґshən) [L. inhalatio] 1. the drawing of air into the lungs; called also inspiration. 2. the drawing of an aerosolized drug into the lungs with the breath. 3. something inhaled, such as a drug or solution of drugs administered (as by a nebulizer or aerosol) by the nasal or oral respiratory route for local or systemic effect.

Medical dictionary. 2011.

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