Definition of alveolus noun from the Oxford Advanced Learner's Dictionary

 

alveolus

 noun
noun
BrE BrE//ælˈviːələs//
 
, also BrE//ˌælviˈəʊləs//
 
; NAmE NAmE//ælˈviːələs//
 
(pl. alveoli
BrE BrE//ælˈviːəlaɪ//
 
, also BrE//ˌælviˈəʊlaɪ//
 
; NAmE NAmE//ælˈviːəlaɪ//
 
; BrE BrE//ælˈviːəliː//
 
, also BrE//ˌælviˈəʊliː//
 
; NAmE NAmE//ælˈviːəliː//
 
)
(anatomy)
 
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one of the many small spaces in each lung where gases can pass into or out of the blood Word Origin late 17th cent.: from Latin, ‘small cavity’, diminutive of alveus.
See the Oxford Advanced American Dictionary entry: alveolus