Relating to both the bronchial tubes and the lungs as a combined respiratory system.
From Greek 'bronchos' (windpipe) + Latin 'pulmonaris' (relating to the lungs from 'pulmo', lung). This term became standard in medical terminology to describe processes involving the entire lower airway and lung.
You'll hear 'bronchopulmonary' used most often in the phrase 'bronchopulmonary dysplasia,' which is a serious lung condition that can develop in premature babies who need ventilators, and it's one reason doctors work so hard to get newborns off breathing machines as quickly as possible.
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