1. an Asian river that rises in the Altai Mountains in northern China and flows generally northwest to become a tributary of the Ob River; [syn: Irtish, Irtish River, Irtysh, Irtysh River]
WordNet (r) 3.0 (2006):
Irtysh
n 1: an Asian river that rises in the Altai Mountains in
northern China and flows generally northwest to become a
tributary of the Ob River [syn: Irtish, Irtish River,
Irtysh, Irtysh River]