The word, 'Solenoid' defines a shape, which turns out to be cylinder-shaped.
Solenoid is an adjective . . . that means that it modifies a noun. The noun in this case is coil: As in 'solenoid coil' which is cylinder-shaped.
In a car, the solenoid coil, or just 'Solenoid' pulls in the electric contactor on a car's starter to turn the starter. After the car starts, the solenoid releases the contactor to where it will be ready for the next engine startup.
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