noun
: a parasitic worm found in the eye: as
a. : either of two slender nematode worms ( Oxyspirura mansoni and O. petrowi ) living beneath the nictitating membrane of the eyes of chickens or other birds
b. : a member of a genus ( Thelazia ) of spiruroid nematodes living in the tear duct and beneath the eyelid of dog, cat, sheep, man, and other mammals and sometimes causing blindness
c. : an African filarial worm ( Loa loa ) that migrates through the subdermal tissues and eyeball of man — compare calabar swelling