2 noun
coil2 [countable]
1CF a continuous series of circular rings into which something such as wire or rope has been wound or twisted
coil of
a coil of rope
2 one ring of wire, rope etc in a continuous series
3TEE a wire or a metal tube in a continuous circular shape that produces light or heat when electricity is passed through it:
the coil in a light bulb
4TTC the part of a car engine that sends electricity to the spark plugs
5 a contraceptive that is a flat curved piece of metal or plastic that is fitted inside a woman's uterus [= IUD]

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