An ingreient; flour is a fine powder made by grinding cereal grains or other suitable edible plant matter high in starch. It is most commonly made from wheat — the word "flour" used without qualification implies wheat flour — but maize (now called corn in many parts of the Western Hemisphere), rye, barley, and rice, amongst many other grasses and non-grain plants (including buckwheat, grain amaranths and many Australian species of acacia), ground legumes and nuts, such as soy, peanuts, almonds, and other tree nuts, are also called flours. Finally flours can be made by grinding the roots of several plants, including cassava, arrowroot and taro. The same substances ground more coarsely are, many cases, called "meal" instead of "flour".