蟠尾絲蟲 [ㄆㄢˊ ㄨㄟˇ ㄙ ㄔㄨㄥˊ; pan2 wei3 si1 chong2] Onchocerca volvulus, the filarial parasite worm causing "river blindness" or onchocerciasis, the second most common cause of blindness in humans ◄ ►