/tay"saks"/ , Pathol.
a rare fatal hereditary disease, occurring chiefly in infants and children, esp. of eastern European Jewish origin, characterized by a red spot on the retina, gradual blindness, and paralysis.
[ 1920-25; named after W. Tay (1843-1927), English physician, and B. Sachs (1858-1944), American neurologist ]