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Definition of "spark plug" [spark plug]

  • A device inserted in the head of an internal-combustion engine cylinder that ignites the fuel mixture by means of an electric spark. (noun)
  • Informal One who gives life or energy to an endeavor. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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