- Pathology. inflammation of a mucous membrane, especially of the respiratory tract, accompanied by excessive secretions.
- inflammation of a mucous membrane with increased production of mucus, esp affecting the nose and throat in the common cold
- the mucus so formed
late 14c., from Medieval Latin catarrus, from Late Latin catarrhus, from Greek katarrhous “a catarrh, a head cold,” literally “a flowing down,” earlier kata rrhoos, ultimately from kata- “down” (see cata-) + rhein “to flow” (see rheum). Related: Catarrhalcatarrhous.
- Inflammation of mucous membranes, especially of the nose and throat.