roux(n = noun.food) Array - a mixture of fat and flour heated and used as a basis for sauces; Array
is a kind of concoction, intermixture, mixture
A thickening, made of flour, for soups and gravies. [1913 Webster]
roux, n. (pl. same) a mixture of fat (esp. butter) and flour used in making sauces etc.
Etymology:
F, = browned (butter): see RUSSET