vortex

Noun
  1. The shape of something rotating rapidly (synset 113900751)
    is a type of: round shape - a shape that is curved and without sharp angles
    same as: convolution, swirl, whirl
  2. A powerful circular current of water (usually the result of conflicting tides) (synset 107447745)
    is a type of: current, stream - a steady flow of a fluid (usually from natural causes)
    subtypes: charybdis - (Greek mythology) a ship-devouring whirlpool lying on the other side of a narrow strait from Scylla
    same as: maelstrom, whirlpool

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