Flatiron meaning : A tough cut of beef from the shoulder of the steer. A simple iron (for pressing laundry) which is heated on a stove. A pair of metal tongs with heated ceramic plates used for straightening hair. (especially referring to the shape of a building) a quadrilateral with two parallel sides, one of which is very short, and whose non-parallel sides are longer than either parallel side. A steeply sloping triangular landform created by the differential erosion of a steeply dipping, erosion-resistant layer of rock overlying softer strata. Having a flatiron shape.