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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.
spiral (plural spirals) ( 1 geometry) A curve that is the locus of a point that rotates about a fixed point while continuously increasing its distance from that point. ( 2 informal) A helix. 3  A self-sustaining process with a lot of momentum involved, so it is difficult to accelerate or stop it at once.