The term 'coarse hair' can be summarized by the crossword solution 'BRISTLE, ' which is a seven-letter word. Bristles are stiff hairs that are typically found on animals, such as pigs and cats, and are used for protection and insulation. They are also used in certain products, such as brushes and brooms. Coarse hair is usually thicker and more rigid than other types of hair, and is often associated with people of African descent.