lens used to concentrate light on an object | a structure consisting of something wound in a continuous series of loops |
an electrical device characterized by its capacity to store an electric charge | reactor consisting of a spiral of insulated wire that introduces inductance into a circuit |
a hollow coil that condenses by abstracting heat | tubing that is wound in a spiral |
an apparatus that converts vapor into liquid | a contraceptive device placed inside a woman's womb |
| a transformer that supplies high voltage to spark plugs in a gasoline engine |
| a round shape formed by a series of concentric circles (as formed by leaves or flower petals) |