| coil | (noun) a structure consisting of something wound in a continuous series of loops | Synonyms: helix, spiral, volute, whorl |
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| (noun) reactor consisting of a spiral of insulated wire that introduces inductance into a circuit | - |
| (noun) tubing that is wound in a spiral | - |
| (noun) a contraceptive device placed inside a woman's womb | - |
| (noun) a transformer that supplies high voltage to spark plugs in a gasoline engine | - |
| (noun) a round shape formed by a series of concentric circles (as formed by leaves or flower petals) | Synonyms: curl, curlicue, gyre, ringlet, roll, scroll, whorl |