Copious discharge of mucus associated with inflammation of mucous membranes, especially of the nose and throat.
[Middle English catarre, from Old French catarrhe, from Late Latin catarrhus, from Greek katarrous, from katarrein, to flow down : kata-, cata- + rhein, to flow; see sreu- in the Appendix of Indo-European roots.]
ca·tarrhal, ca·tarrhous adj.
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