Pathology. inflammation of a mucous membrane, especially of the respiratory tract, accompanied by excessive secretions.
Origin: 1350–1400;Middle English < Late Latincatarrhus < Greekkatárrous literally, down-flowing, equivalent to katarr(eîn) to flow down (kata-cata- + rheîn to flow) + -ous, variant of -eos (theme vowel + adj. suffix)
late 14c., from M.L. catarrus, from L.L. catarrhus, from Gk. katarrhous "a catarrh," lit. "a flowing down," from kata- "down" + rhein "to flow" (see rheum).