ˈgid noun
( -s )
Etymology: back-formation from giddy (I)
: a disease principally affecting sheep that is caused by the presence in the brain of the coenurus of a tapeworm ( Multiceps multiceps ) of the dog and related carnivores and is characterized by cerebral disturbances, dilated pupils, dizziness and circling movements, emaciation, and usually death — called also sturdy, turn-sick, waterbrain