Etymology
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pleurisy (n.)

"inflammation of the membrane surrounding the lungs," late 14c., pleoresi, from Old French pleurisie (13c., Modern French pleurésie) and directly from Late Latin pleurisis "pleurisy," alteration of Latin pleuritis "pain in the side," from Greek pleuritis, from pleura "side of the body, rib," a word of unknown origin. Spelling altered in Late Latin on model of Latin stem plur- "more" (as in Medieval Latin pluritas "multitude"), as if in reference to "excess of humors." Related: Pleuritic.

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Definitions of pleurisy

pleurisy (n.)
inflammation of the pleura of the lungs (especially the parietal layer);
From wordnet.princeton.edu