Peanaut P-nut noun 1. A person who makes great discoveries while exploring peanuts. Antonym Peanaught: One who tries but fails to become a Peanaut. "Perhaps the most well-known peanaut was George Washington Carver, who briefly domesticated the abominable peanut." -Widdle, Betsy. "Essay on George Washington Carver for Ms. Neary's 6th Grade History Class".