[ ong-koh-ser-kahy-uh-sis ]
/ ˌɒŋ koʊ sərˈkaɪ ə sɪs /
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noun Pathology.
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.
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The rainy weather could not ________ my elated spirits on my graduation day.
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Also on·cho·cer·co·sis [ong-koh-ser-koh-sis]. /ˌɒŋ koʊ sərˈkoʊ sɪs/.
Also called river blindness.

Origin of onchocerciasis

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

British Dictionary definitions for onchocerciasis

/ (ˌɒŋkəʊsəˈkaɪəsɪs) /

noun plural -ses (-siːz)
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 blindnessAlso called: river blindness

Word Origin for onchocerciasis

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

Medical definitions for onchocerciasis

[ ŏng′kō-sər-kīə-sĭs ]

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