​CUDDALORE, or KUDALUR, an important town in South Arcot, Madras, India, on the Gadelain and Pounaiyar rivers, about 125 miles S. of Madras. The river admits vessels to within about a mile from the town's limits and the harbor is the largest in South Arcot. The industries are cotton and carpet, sugar, paper, and oil. There is a fort and temple, and the environs are picturesque. Pop. about 60,000.