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A Meander

  1. One of the turns of a winding, crooked, or involved course.
  2. the meanders of an old river, or of the veins and arteries in the body
  3. A tortuous or intricate movement.
  4. Fretwork.
  5. Perplexity.

Synonym of Greek key.

  1. (mathematics) A self-avoiding closed curve which intersects a line a number of times.