The part of an internal combustion engine which forms a high-voltage electric spark which ignites the fuel-air mixture to begin the power stroke.

The sound produced, in an internal combustion engine, by the ignition of the fuel-air mixture before the piston reaches top dead centre

A gap, between two electrical terminals, across which sparks are generated. / Such a gap as a component of an engine's ignition system, especially that between the electrodes of a spark plug.

past tense of spark test

present of spark test

plural of spark test

An instance of spark testing.

(metalworking) To test for the general character of a steel, when testing a piece of steel, by grinding it, producing sparks, using color of sparks to determine its general classification.

(UK) Completely asleep or unconscious.

(transitive, colloquial) To render unconscious; to knock out.