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peak expiratory flow

[ pēk ]
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n.
The maximum flow of air at the outset of forced expiration, which is reduced in proportion to the severity of airway obstruction, as in asthma.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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