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Wiktionary
beltfish

n. 1 The fish ''Trichiurus lepturus''. 2 The fish ''Lepidopus caudatus''.

Wikipedia
Beltfish

The term beltfish can refer to either:

  • Trichiurus lepturus (largehead hairtail, Atlantic cutlassfish, Pacific cutlassfish)
  • Lepidopus caudatus (silver scabbardfish, frostfish, ribbonfish, scabbardfish, southern frostfish)