Relating to expiration.
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ex·pi·ra·to·ry ik-'spī-rə-.tōr-ē, ek-, -.tȯr-; 'ek-sp(ə-)rə- adj of, relating to, or employed in the expiration of air from the lungs <\expiratory muscles> <an \expiratory cough>
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ex·pi·ra·to·ry (ek-spiґrə-tor″e) pertaining to exhalation (expiration).Medical dictionary. 2011.