Maize flour or corn flour is a flour ground from dried maize (corn). It is a common staple food, and is ground to coarse, medium, and fine cMaize flour or corn flour is a flour ground from dried maize (corn). It is a common staple food, and is ground to coarse, medium, and fine consistencies. Coarsely ground corn flour (meal) is known as cornmeal.onsistencies. Coarsely ground corn flour (meal) is known as cornmeal.