[soh-luh-noid, sol-uh-]
Electricity. an electric conductor wound as a helix with small pitch, or as two or more coaxial helices, so that current through the conductor establishes a magnetic field within the conductor.
Also called solenoid switch. a switch controlled by such an arrangement, in which a metal rod moves when the current is turned on: used in automotive starting systems.
Meteorology. a space formed by the intersection of isobaric and isosteric surfaces.

1825–35; < French solénoïde < Greek sōlḗn pipe, channel + French -oïde -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
solenoid (ˈsəʊlɪˌnɔɪd)
1.  a coil of wire, usually cylindrical, in which a magnetic field is set up by passing a current through it
2.  a coil of wire, partially surrounding an iron core, that is made to move inside the coil by the magnetic field set up by a current: used to convert electrical to mechanical energy, as in the operation of a switch
3.  such a device used as a relay, as in a motor vehicle for connecting the battery directly to the starter motor when activated by the ignition switch
[C19: from French solénoïde, from Greek sōlēn a pipe, tube]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"coil of insulated wire carrying an electrical current and having magnetic properties," 1827, from Fr. solénoïde, from Gk. solen "pipe, channel" + comb. form of eidos "form, shape" (see -oid).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
solenoid   (sō'lə-noid')  Pronunciation Key 

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A coil of wire that acts as an electromagnet when electric current is passed through it, often used to control the motion of metal objects, such as the switch of a relay.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Install solenoid valves in horizontal lines with coil at top.
If the solenoid valve leaks, contact your supervisor to arrange for an as-is calibration prior to solenoid valve replacement.
The solenoid regulates the power from the battery to the starter.
Solenoid valve, an electrically controlled hydraulic or pneumatic valve.
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