Harrow: Tilling implement formed by a wooden frame with wooden or iron teeth. In industrially manufactured harrows, the frame and the teeth are almost always made of metal. There are square, rectangular, triangular, pyramidal and round harrows and are used to pick up the branches and grasses the plow uproots, break clods and loosen the earth, thus improving the work done with the plow. Plank harrows are typologically harrows, but have no teeth. They are made with one or more trunks, with or without a beam, with thick branches in the form of a V and transversal poles or poles intertwined with strong twigs. They are used to level and flatten the land. That is why they are commonly called flat harrows.