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English definition of “alveolus”

alveolus

noun [C] uk   /ˌæl.viˈəʊ.ləs/ us    /ælˈviː.ə-/ (plural alveoli   /-laɪ/   ) specialized
one of the many very small air bags in the lungs, with thin walls that allow oxygen to enter the blood
(Definition of alveolus from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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