Merriam-Webster Collegiate Dictionary - coho

 noun  (plural ~s or ~)  Etymology: Halkomelem (Salishan language of southwest British Columbia) k?w??xw??  Date: 1869 a rather small Pacific salmon (Oncorhynchus kisutch) that has light-colored flesh and is native to both coasts of the North Pacific and is stocked in the Great Lakes — called also ~ salmon, silver salmon