Definition of Powder River in English:

Powder River

Syllabification: Pow·der Riv·er

Entry from US English dictionary

A river that flows for 485 miles (780 km) from northeastern Wyoming into southern Montana to join the Yellowstone River.

Definition of Powder River in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up