catarrh /kəˈtɑɹ/ noun4 •Inflammation of a mucous membrane. •Especially, that of the nose and throat.And then as to your scurvys, and gouts, rheumatisms, consumptions, coughs and catarrhs, tar-vvater and turpentine vvill make you as sound as a roach. — 1763 •Rhinitis or rhinosinusitis; cold or coldlike illness; common cold. •The discharge (fluid) associated with this condition.He coughed violently and spat out the catarrh irritating his throat. formscatarrhs