Definition of dolphinfish
: either of two colorful, iridescent, saltwater fish (Coryphaena equiselis and C. hippurus of the family Coryphaenidae) that are widely distributed in tropical and temperate seas and have a long laterally compressed body and a deeply forked tail fin ◆The common dolphinfish (Coryphaena hippurus) is valued as a food fish and is often called mahi-mahi.
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