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Noun: sparkplug wrench
  1. A wrench for removing or tightening spark plugs into the cylinder head of an internal combustion engine
    "He couldn't find his sparkplug wrench and had to borrow one from his neighbour"
Noun: spark plug  spaa(r)k plúg
  1. Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark
    "The mechanic replaced all six spark plugs to improve the engine's efficiency";
    - sparking plug, plug

Derived forms: spark plugs

Type of: electrical device, spanner [Brit], wrench

Part of: ignition, ignition system

Encyclopedia: Spark plug