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
First Known Use of blue marlin
Seen and Heard
What made you want to look up blue marlin? Please tell us where you read or heard it (including the quote, if possible).