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

(transitive) To initiate something by providing the necessary conditions.

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.

Any device that prevents the emission of flammable debris from combustion sources.

vital force (or the application of such a force)

An induction coil used for producing sparks, as in an internal combustion engine. / A self-induction coil used to increase the spark in an electric gas-lighting apparatus.

A spark produced by the jumping of electricity across a permanent gap.

plural of spark coil

Sigmops bathyphilus, a species of bioluminescent deepwater fish that lives in the bathypelagic.

(ichthyology) A type of occular radiance, which is the redirection of infalling light from above, reflecting it into the visual field to illuminate the field of vision, for diurnal active photolocation.