onchocerciasis

on·cho·cer·ci·a·sis

noun \ˌäŋ-kō-ˌsər-ˈkī-ə-səs\

plural on·cho·cer·ci·a·ses \-ˌsēz\

Definition of ONCHOCERCIASIS

: 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