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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.
ignition coil - an induction coil that converts current from a battery into the high-voltage current required by spark plugs. ignition system, ignition - the mechanism that ignites the fuel in an internal-combustion engine. induction coil - a coil for producing a high voltage from a low-voltage source. Translations.