an instrument for determining the capacity of the lungs.

1840–50; spiro-1 + -meter

spirometric [spahy-ruh-me-trik] , spirometrical, adjective
spirometry, noun
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World English Dictionary
spirometer (spaɪˈrɒmɪtə)
Compare pneumatometer an instrument for measuring the air capacity of the lungs

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American Heritage
Medical Dictionary

spirometer spi·rom·e·ter (spī-rŏm'ĭ-tər)
An instrument for measuring the volume of air entering and leaving the lungs.

spi'ro·met'ric (-rə-mět'rĭk) adj.
spi·rom'e·try n.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
The patient uses an incentive spirometer at regular intervals to improve breathing and loosen sputum.
He stands, takes a deep breath and blows into a spirometer.
The spirometer's calibration is checked by the technician each day of use.
Daily checks for leaks and volume accuracy of the spirometer are needed.
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