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Definition of alveolus noun from the Oxford Advanced American Dictionary

 

alveolus

 noun
noun
NAmE//ˌælˈviələs//
 
(pl. alveoli
NAmE//ˌælˈviəˌlaɪ//
 
, NAmE//ˌælˈviəli//
 
)
(anatomy)
 
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one of the many small spaces in each lung where gases can pass into or out of the blood
See alveolus in the Oxford Advanced Learner's Dictionary