Spark plug

Webster's Dictionary of the English Language

·add. ·- 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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Webster's Dictionary of the English Language
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·add. ·- A spark produced by the jumping of electricity across a permanent gap. ...

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·add. ·- A self-induction coil used to increase the spark in an electric gas-lighting apparatus. II...

Webster's Dictionary of the English Language
Spark gap
·add. ·- The space filled with air or other dielectric between high potential terminals (as of an el...

Webster's Dictionary of the English Language
to spark it
To court. Used chiefly in New England. You were a nation sight wiser than brother Jonathan, sister ...

Dictionary of American Words And Phrases by John Russell Bartlett.