verb (used with object), inhaled, inhaling.
to breathe in; draw in by breathing: to inhale the polluted air.
verb (used without object), inhaled, inhaling.
to breathe in, especially the smoke of cigarettes, cigars, etc.: Do you inhale when you smoke?

1715–25; in-2 + (ex)hale

uninhaled, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
inhale (ɪnˈheɪl)
to draw (breath) into the lungs; breathe in
[C18: from in-² + Latin halāre to breathe]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1623 (implied in inhalation), from L. inhalare "breathe upon," from in- "upon" + halare "breathe." Taken in Fr. and Eng. as the opposite of exhale. Slang sense of "eat rapidly" is recorded from 1924.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

inhale in·hale (ĭn-hāl')
v. in·haled, in·hal·ing, in·hales

  1. To breathe in; inspire.

  2. To draw something such as smoke or a medicinal mist into the lungs by breathing; inspire.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for inhaling
Modern amphibians breathe by inhaling air into lungs, where oxygen is absorbed.
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