Definition of blue marlin
: a very large marlin (Makaira nigricans) of the Atlantic Ocean that is blue above and silvery white below, may reach a length of 14 feet (4.3 meters) and a weight of one ton (907 kilograms), and is often valued as a sport fish
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Merriam-Webster unabridged
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Time Traveler for blue marlin
The first known use of blue marlin was in 1937
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