Noir definition, black; noting the black numbers in roulette. See more. Pinot Noir · Beurre noir · Boudin noir. noir meaning, definition, what is noir: used for describing films or books that show the world as being unpleasant, strange, or. Learn more. Noir is French for black and is a type of fiction or a film that has tough characters and is cynical, bleak and pessimistic in nature. An example of noir is the film.