Definitions for: Spark Plug


[n] electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark



Webster (1913) Definition: Spark plug
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.

Synonyms: plug, sparking plug

See Also: electrical device, ignition, ignition system

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