nerd Syllabification: (nerd)Pronunciation: /nərd/Definition of nerd noun informal a foolish or contemptible person who lacks social skills or is boringly studious:one of those nerds who never asked a girl to dance a single-minded expert in a particular technical field:a computer nerdDerivatives nerdiness noun nerdish adjective nerdishness noun nerdy adjective Origin: 1950s: of unknown originnerd in other Oxford dictionaries Definition of nerd in the British & World English dictionary