spark plug (def 1).
a device screwed into the cylinder head of an internal-combustion engine to ignite the explosive mixture by means of an electric spark which jumps across a gap between a point earthed to the body of the plug and the tip of a central insulated rod Also called spark plug
noun, Electricity. 1. the minimum voltage required to produce a spark across a given spark gap.
[spahrk-kil-er] /ˈspɑrkˌkɪl ər/ noun, Electricity. 1. a device for diminishing sparking, consisting of a capacitor and a resistor connected in series across two points where sparking may occur in a circuit.
verb (used without object), sparkled, sparkling. 1. to issue in or as if in little sparks, as fire or light: The candlelight sparkled in the crystal. 2. to emit little sparks, as burning matter: The flames leaped and sparkled. 3. to shine or glisten with little gleams of light, as a brilliant gem; glitter; coruscate. […]
noun 1. a person or thing that sparkles. 2. a firework that emits little sparks. 3. a sparkling gem, especially a diamond. 4. Informal. a bright eye. noun 1. a type of firework that throws out showers of sparks 2. (informal) a sparkling gem spare tire