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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.
LINK / CITE ADD TO WORD LIST. noun. The definition of a helix is a spiral, or something shaped like a spiral. An example of a helix is the shape inside the shell of a chambered nautilus sea creature.elix. pl. heâ²lixes or helâ²iÂ·cesÂ·. 1  any spiral, as one lying in a single plane or, esp., one moving around a right circular cone or cylinder at a constant angle, as a screw or bolt thread does. 2  Anat. the folded rim of cartilage around the outer ear.