coil - definition and synonyms

noun [countable] 

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  1. 1
    a long thin piece of something that forms rings or curls

    a coil of rope

    1. a.
      something that has a long curved shape

      a coil of black smoke

  2. 4
    a curved piece of plastic that is put inside a woman’s uterus as a contraceptive (=to prevent her from becoming pregnant)