marlin Syllabification: (mar·lin)Pronunciation: /ˈmärlən/Definition of marlin noun a large edible billfish of warm seas that is a highly prized game fish and typically reaches a great weight. Genera Makaira and Tetrapterus, family Istiophoridae: several species, including the striped marlin (T. audax) Origin: early 20th century: from marlinspike (with reference to its pointed snout)marlin in other Oxford dictionaries Definition of marlin in the British & World English dictionary