Mandelbrot, Benoît Syllabification: (Man·del·brot, Benoît)Pronunciation: /ˈmandlˌbrät, -ˌbrō, ˌmändelˈbrô/Definition of Mandelbrot, Benoît (1924–2010), French mathematician, born in Poland. He is known as the pioneer of fractal geometry. Mandelbrot, Benoît in other Oxford dictionaries Definition of Mandelbrot, Benoît in the British & World English dictionary