onchocerciasis \onchocerciasis\ n. (Med.)
An infection with nematodes of the genus {Onchocerca},
especially {Onchocerca volvulus}. Untreated, such infections
can cause serious dermatological problems, and in advanced
cases may lead to blindness. In certain areas of tropical
Africa the blindness caused by onchocerciasis is called
{river blindness}.
[PJC]