[res-per-uh-tawr-ee, -tohr-ee, ri-spahyuhr-uh-]
pertaining to or serving for respiration: respiratory disease.

1780–90; < Late Latin respīrātōrius, equivalent to Latin respīrā(re) to respire + -tōrius -tory1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
respiratory or (rarely) respirational (ˈrɛspərətərɪ, -trɪ, ˌrɛspəˈreɪʃənəl)
of, relating to, or affecting respiration or the organs used in respiration
respirational or (rarely) respirational

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

respiratory res·pi·ra·to·ry (rěs'pər-ə-tôr'ē, rĭ-spīr'ə-)
Of, relating to, used in, or affecting respiration.

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
These were earmarked for people at high risk, those with respiratory troubles
  such as asthma or emphysema.
Levels of nitrogen oxides, fossil fuel combustion emissions implicated in
  respiratory disease, have fallen dramatically.
And this means that pepper sprays pose a genuine risk to people with asthma and
  other respiratory conditions.
They might cause unpleasant upper respiratory irritations, but they will not
  send anyone into anaphylactic shock.
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