Definition of Chinook salmon
: a large, usually red-fleshed, commercially important salmon (Oncorhynchus tshawytscha) of the northern Pacific Ocean that is typically bluish-green above with silvery sides, has a dark mouth with black gums, and attains an average weight of about 30 to 40 pounds (13.5 to 18 kilograms) but may sometimes exceed 120 pounds (54 kilograms) —called also black salmon, king salmon
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