A river that flows for 1,000 miles (1,600 km) from the Andes in western Bolivia along the Argentina-Paraguay border to join the Paraguay River at Asunción in Paraguay.
Definition of Pilcomayo River in US English:
Pilcomayo River
proper nounˌpilkəˌmäyō ˈrivər
A river that flows for 1,000 miles (1,600 km) from the Andes in western Bolivia along the Argentina-Paraguay border to join the Paraguay River at Asunción in Paraguay.