What is pleurity?

Answer 1

Pleuritis is inflammation of the pleura, the lining of the lungs. It is painful.

Answer 2

Pleurity seems to be a misspelling. Perhaps you meant pleurisy, which is an inflammation of the lining of the lungs and chest (pleura) that can cause sharp chest pain, especially when breathing. It is often due to a viral infection or other respiratory conditions. Treatment may involve medication to reduce inflammation and pain relief.