Saw-toothed chain is a type of chain that has teeth along its length, resembling the shape of a saw blade. It is commonly used in industrial applications, such as for conveyor belts and other machinery. The crossword solution for this term is 'SIERRAS, ' which is a Spanish word meaning 'mountain range.' This term is often used to refer to the jagged peaks of mountain ranges, which are similar in shape to the saw-toothed chain.