What author invented the word "nerd" in a book from 1950?

Dr. Seuss invented the word “nerd” in his 1950 book If I Ran the Zoo. The word appears in a playful list of imaginary creatures that narrator Gerald McGrew says he would bring back to his zoo.

The relevant rhyme names “an It-Kutch, a Preep, and a Proo,” followed by “a Nerkle, a Nerd, and a Seersucker too.” In the book, a nerd is simply a fanciful animal with no explanation or connection to intelligence, studying, or social awkwardness.

The modern meaning developed later. In 1951, Newsweek reported “nerd” as Detroit slang for an unfashionable or dull person. Over subsequent decades, the label became associated with intense academic or technical interests, limited social confidence, and enthusiasm for subjects such as computers, science, comics, or games.

The wording “invented” is common trivia shorthand: If I Ran the Zoo is generally credited with the first printed modern-English appearance of the word, not necessarily with creating every earlier oral use. Dr. Seuss’s full name was Theodor Seuss Geisel.