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

 

pleura

 noun
noun
BrE BrE//ˈplʊərə//
 
; NAmE NAmE//ˈplʊrə//
 
(pl. pleurae
BrE BrE//ˈplʊəriː//
 
; NAmE NAmE//ˈplʊriː//
 
)
(anatomy)
 
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one of the two membranes that surround the lungs Word Origin late Middle English: via medieval Latin from Greek, literally ‘side of the body, rib’.
See the Oxford Advanced American Dictionary entry: pleura