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pleura (n.)

"sereus membrane lining the chest cavity," early 15c., from medical Latin, from Greek pleuron "a rib," in plural, pleura, "the ribs, side of the body," also "flank of an army, page of a book," a word of unknown origin.

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Definitions of pleura from WordNet

pleura (n.)
the thin serous membrane around the lungs and inner walls of the chest;
From wordnet.princeton.edu