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coil (plural coils) Something wound in the form of a helix or spiral. the sinuous coils of a snake. Washington Irving The wild grapevines that twisted their coils from tree to tree. Any intrauterine device (Abbreviation: IUD)âthe first IUDs were coil-shaped.
An ignition coil, which is also known as a spark coil is an induction coil in an automobileâs ignition system. It transforms a storage batteryâs 12 volts to the thousands of volts needed to spark the spark plugs.