Indus1 Syllabification: (In·dus)Pronunciation: /ˈindəs/Definition of Indus a river in southern Asia, about 1,800 miles (2,900 km) long, that flows from Tibet through Kashmir and Pakistan to the Arabian Sea. Along its valley an early civilization flourished from circa 2600 to 1760 bc. Indus in other Oxford dictionaries Definition of Indus in the British & World English dictionary