Pathology. inflammation of a mucous membrane, especially of the respiratory tract, accompanied by excessive secretions.

1350–1400; Middle English < Late Latin catarrhus < Greek katárrous literally, down-flowing, equivalent to katarr(eîn) to flow down (kata- cata- + rheîn to flow) + -ous, variant of -eos (theme vowel + adj. suffix)

catarrhal, catarrhous, adjective
catarrhally, adverb
noncatarrhal, adjective
postcatarrhal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
catarrh (kəˈtɑː)
1.  inflammation of a mucous membrane with increased production of mucus, esp affecting the nose and throat in the common cold
2.  the mucus so formed
[C16: via French from Late Latin catarrhus, from Greek katarrous, from katarrhein to flow down, from kata- down + rhein to flow]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

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).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

catarrh ca·tarrh (kə-tär')
Inflammation of mucous membranes, especially of the nose and throat.

ca·tarrh'al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Others think the disease is a form of gastrointestinal catarrh.
Catarrh cannot be except by making the entire mucous membrane healthy more people than all other diseases and accidents combined.
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