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.
Also, onchocercosis [ong-koh-ser-koh-sis] .
Also called river blindness.

1910–15; < Neo-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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World English Dictionary
onchocerciasis (ˌɒŋkəʊsəˈkaɪəsɪs)
n , pl -ses
Also called: river blindness 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
[C20: from Onchocerca, the genus of worms + -iasis]

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American Heritage
Medical Dictionary

onchocerciasis on·cho·cer·ci·a·sis (ŏng'kō-sər-kī'ə-sĭs) or on·cho·cer·co·sis (-sər-kō'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. Also called river blindness, volvulosis.

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