Medical Definition of onchocerciasis
plural onchocerciases \-ˌsēz\play
: 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 , ; see craw-craw
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