noun \ˌäŋ-kō-ˌsər-ˈkī-ə-səs\
plural on·cho·cer·ci·a·ses \-ˌsēz\


: infestation with or disease caused by filarial worms of the genus Onchocerca; especially : a human disease that is marked by subcutaneous nodules, dermatitis, and visual impairment and is caused by a worm (O. volvulus) which is found in Africa and tropical America and transmitted by the bite of a female blackfly—called also onchocercosis, river blindness; see craw-craw

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