in halation

inhalation

[in-huh-ley-shuhn]
noun
1.
an act or instance of inhaling.
2.

Origin:
1615–25; inhale + -ation

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World English Dictionary
inhalation (ˌɪnhəˈleɪʃən)
 
n
1.  the act of inhaling; breathing in of air or other vapours
2.  an inhalant formulation

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

inhalation in·ha·la·tion (ĭn'hə-lā'shən)
n.

  1. The act or an instance of inhaling.

  2. A solution of a drug or a combination of drugs administered to the respiratory passages as a nebulized mist.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
inhalation   (ĭn'hə-lā'shən)  Pronunciation Key 
The act of taking in breath. Inhalation results from the negative pressure in the lungs caused by contraction of the diaphragm, which causes it to move downwards and to expand the chest cavity. The resulting flow of air into the lungs restores a pressure equal to that of the atmosphere. Also called inspiration. Compare exhalation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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