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onchocerciasis

[ong-koh-ser-kahy-uh-sis] /ˌɒŋ koʊ sərˈkaɪ ə sɪs/
noun, Pathology
1.
an infestation with filarial worms of the genus Onchocerca, common in tropical America and Africa, transmitted by black flies, and characterized by nodules under the skin, an itchy rash, eye lesions, and in severe cases, elephantiasis.
Also, onchocercosis
[ong-koh-ser-koh-sis] /ˌɒŋ koʊ sərˈkoʊ sɪs/ (Show IPA)
.
Also called river blindness.
Origin
1910-1915
1910-15; < New Latin Onchocerc(a) a genus of filarioid worms (oncho- (correctly onco- < Greek ónk(os) barb + -o- -o-) + -cerca feminine of -cercus -tailed < Greek, adj. derivative of kérkos tail) + -iasis
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for onchocercosis

onchocerciasis

/ˌɒŋkəʊsəˈkaɪəsɪs/
noun (pl) -ses (-siːz)
1.
a disease found in parts of Africa and tropical America that is caused by a parasitic worm, Onchocerca volvulus, and transmitted to humans by various species of black fly. It results in inflammation of the skin and in some cases blindness Also called river blindness
Word Origin
C20: from Onchocerca, the genus of worms + -iasis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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onchocercosis in Medicine

onchocerciasis on·cho·cer·ci·a·sis (ŏng'kō-sər-kī'ə-sĭs) or on·cho·cer·co·sis (-sər-kō'sĭs)
n.
A disease occurring in tropical Africa and Central America, transmitted by black flies and caused by infestation with filariform nematodes of the genus Onchocerca, especially O. volvulus, and characterized by nodular swellings on the skin and lesions of the eyes. Also called river blindness, volvulosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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