plural lower respiratory tracts
Definition of lower respiratory tract
: the part of the respiratory tract including the trachea, bronchi, and lungs — compare upper respiratory tract
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“Lower respiratory tract.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lower%20respiratory%20tract. Accessed 6 May. 2021.
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Time Traveler for lower respiratory tract
The first known use of lower respiratory tract was in 1881
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