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spark plug

 - 2 dictionary results

spark plug

–noun
1. a device designed to fit in each cylinder of a gasoline-powered internal-combustion engine and to produce the electric spark for igniting the mixture of gasoline and air.
2. Informal. a person who leads, inspires, or animates a group.

Origin:
1900–05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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spark plug  


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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.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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