D defs.my
Entry 1 sense Webster, 1913

Spark gap

· IPA
01 The space filled with air or other dielectric between high potential terminals (as of an electrostatic machine, induction coil, or condense…
  1. 1.
    The space filled with air or other dielectric between high potential terminals (as of an electrostatic machine, induction coil, or condenser), through which the discharge passes; the air gap of a jump spark.(Elec.)