onchocerciasis

noun

on·cho·cer·ci·a·sis | \ ˌäŋ-kō-ˌsər-ˈkī-ə-səs,

ˌäŋ-kə-\

plural onchocerciases\ ˌäŋ-kō-ˌsər-ˈkī-ə-ˌsēz ,

ˌäŋ-kə- \

Definition of onchocerciasis

: infestation with or disease caused by filarial worms (genus Onchocerca) especially : a human disease marked by subcutaneous nodules, dermatitis, and visual impairment and caused by a worm (O. volvulus) found in Africa and tropical America which is transmitted by the bite of a female blackfly

— called also river blindness

Examples of onchocerciasis in a Sentence

Recent Examples on the Web

Fifteen years ago as much as half the population was infected with the worm that causes onchocerciasis, or river blindness (see map). — The Economist, "How Sierra Leone is beating tropical diseases," 23 June 2018 Yet by 2017 only 2% of people carried the worm, and there had been no new cases recorded of people going blind from onchocerciasis in a decade. — The Economist, "How Sierra Leone is beating tropical diseases," 23 June 2018 River blindness, or onchocerciasis, is a nasty disease that has burdened Africa for as long as anyone can remember. — Brian Rinker, CNN, "New tech revolutionizes fight against ancient diseases in Africa, Asia," 17 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'onchocerciasis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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The first known use of onchocerciasis was in 1911

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onchocerciasis

noun

on·cho·cer·ci·a·sis | \ ˌäŋ-kō-ˌsər-ˈkī-ə-səs

plural onchocerciases\ -ˌsēz

Medical Definition of onchocerciasis

: infestation with or disease caused by filarial worms of the genus Onchocerca especially : a human disease marked by subcutaneous nodules, dermatitis, and visual impairment that is caused by a worm (O. volvulus) found in Africa and tropical America and transmitted by the bite of a female blackfly

— called also onchocercosis, river blindness

— see craw-craw