harrow

n. Heavy frame with iron teeth dragged over ploughed land to break up clods etc. v. 1 draw a harrow over (land). 2 (usu. As harrowing adj.) Distress greatly. [old norse hervi]

n. An implement of agriculture, usually formed of pieces of timber or metal crossing each other, and set with iron or wooden teeth. It is drawn over plowed land to level it and break the clods, to stir the soil and make it fine, or to cover seed when sown.