蟠尾丝虫

pán wěi sī chóng

Onchocerca volvulus, the filarial parasite worm causing "river blindness" or onchocerciasis, the second most common cause of blindness in humans

蟠

pán

to coil

尾

wěi

tail

丝

sī

silk

虫

chóng

lower form of animal life, including insects, insect larvae, worms and similar creatures