Definition of solenoid
: a coil of wire usually in cylindrical form that when carrying a current acts like a magnet so that a movable core is drawn into the coil when a current flows and that is used especially as a switch or control for a mechanical device (such as a valve)
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Merriam-Webster unabridged
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Time Traveler for solenoid
The first known use of solenoid was in 1827
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