#whirlpool__vortex__maelstrom  a powerful circular current of water (usually the resulting of conflicting tides)
  supertype:  #current__stream  a steady flow (usually from natural causes); "the raft floated downstream on the current"; "he felt a stream of air"
  subtype:  #Charybdis  (Greek mythology) a ship-devouring whirlpool lying on the other side of a narrow strait from Scylla

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