Bible Dictionaries
Spark Plug
Webster's Dictionary
In internal-combustion engines with electric ignition, a plug, screwed into the cylinder head, having through it an insulated wire which is connected with the induction coil or magneto circuit on the outside, and forms, with another terminal on the base of the plug, a spark gap inside the cylinder.
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Bibliography Information
Webster, Noah. Entry for 'Spark Plug'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/spark-plug.html. 1828.