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spark plug
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Tweet n. 1. A device inserted in the head of an internal-combustion engine cylinder that ignites the fuel mixture by means of an electric spark. 2. Informal One who gives life or energy to an endeavor.  (click for a larger image) spark plugcutaway view A. terminal B. ceramic insulation C. center electrode D. gap E. ground electrode |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
tr.v. spark·plugged, spark·plug·ging, spark·plugs Informal To inspire or energize (an endeavor, for example). |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
