pleu ‧ ri ‧ sy /ˈplʊərəsi, ˈplʊərɪsi $ ˈplʊr-/ BrE AmE noun [uncountable]
[ Date: 1300-1400 ; Language: Old French ; Origin: pleuresie , from Latin pleuritis , from Greek , from pleura 'side' ]
a serious illness which affects your lungs, causing severe pain in your chest