A long, flat, silver-colored fish with a sharp, blade-like tail that looks like a cutlass sword.
From 'cutlass' (a curved sword used by sailors) and 'fish,' named for the weapon-like appearance of its elongated body and sharp tail fin. The word cutlass itself comes from French 'coutelas,' ultimately from Latin 'cultellus' meaning 'small knife.'
Cutlassfish can grow up to 6 feet long and live so deep in the ocean that they're rarely seen—but when fishermen accidentally catch them, they're sometimes mistaken for sea serpents because of their bizarre knife-like shape!
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