noir Syllabification: (noir)Pronunciation: /nwär/Definition of noir noun a genre of crime film or fiction characterized by cynicism, fatalism, and moral ambiguity:his film proved that a Brit could do noir as darkly as any American a film or novel in the noir genre: he says he’s making a noirDerivatives noirish adjective noir in other Oxford dictionaries Definition of noir in the British & World English dictionary