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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.
Noun. 1. Tesla coil-a step-up transformer with an air core; used to produce high voltages at high frequencies. transformer-an electrical device by which alternating current of one voltage is changed to another voltage.1  Facebook.. Tesla coil-a step-up transformer with an air core; used to produce high voltages at high frequencies. transformer-an electrical device by which alternating current of one voltage is changed to another voltage. 1  Facebook.