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
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Merriam-Webster unabridged
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Time Traveler for onchocerciasis
The first known use of onchocerciasis was in 1911
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