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English definition of “alveolus”

alveolus

noun [C]     /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 Substances and structures in the body
(Definition of alveolus noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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