Definition of driftfish in English:

noundriftfish, driftfishes

• A slender-bodied bottom-dwelling fish found in the deeper waters of warm seas.

  Family Nomeidae (or Stromateidae): several genera, in particular Ariomma

  ‘I think the fish is a driftfish.’

  ‘The man-of-war fish is a driftfish found in all tropical and subtropical oceans of the world.’