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3 definitions found
 for spark plug
From The Collaborative International Dictionary of English v.0.48 :

  Spark plug \Spark plug\
     In internal-combustion engines with electric ignition, a
     plug, screwed into the cylinder head, connected with the
     induction coil or magneto circuit on the outside, and used to
     produce a spark to ignite the fuel-air mixture in the engine.
     [Webster 1913 Suppl. +PJC]

From WordNet (r) 3.0 (2006) :

  spark plug
      n 1: electrical device that fits into the cylinder head of an
           internal-combustion engine and ignites the gas by means of
           an electric spark [syn: spark plug, sparking plug,

From Moby Thesaurus II by Grady Ward, 1.0 :

  35 Moby Thesaurus words for "spark plug":
     abettor, activator, actuator, animator, arouser, cajoler, coax,
     coaxer, encourager, energizer, firer, gadfly, galvanizer,
     human dynamo, impeller, inducer, inspirer, life, motivating force,
     motive power, mover, moving spirit, persuader, pleader,
     prime mover, prompter, restorative, spark, sparker, stimulant,
     stimulator, stimulus, tempter, tonic, wheedler

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