The slang term nerd means an intelligent but single-minded person, obsessed with a certain hobby or pursuit, e.g. a computer nerd. But the word that has been the bane of so many elementary schoolers' existence was actually invented by their king: none other than Dr. Seuss himself! The word first appeared in print in Seuss' 1950 picture book, If I Ran the Zoo, though Seuss' "nerd" is a small animal from the land of Ka-Troo, not a pale kid with glasses taped together.