A "furrow" is a long, narrow trench or groove that is often created in soil during farming. Farmers use furrows to plant seeds, as they provide a structured way to organize crops and ensure proper spacing. Furrows can also help with irrigation, allowing water to flow directly to the roots of plants. In addition to agriculture, the term "furrow" can refer to a line or wrinkle on a surface, such as the skin. For example, a furrowed brow may indicate concentration or worry. Furrows can also be found in various natural formations, like the grooves left by glaciers in the earth.