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English word solenoid comes from English -oid, Ancient Greek σωλήν
-oid (English)
Of similar form to, but not the same as. Having the likeness of. Forms adjectives and nouns.
σωλήν (Ancient Greek)
solenoid (English)
A coil of wire that acts as a magnet when an electric current flows through it. A mechanical switch consisting of such a coil containing a metal core, the movement of which is controlled by the current.