(in an automotive ignition system) a transformer consisting of two wire windings or coils in which low-voltage direct current is fed through the primary winding to generate high-voltage spark pulses in the secondary winding.
Origin of ignition coil
First recorded in 1895–1900
Also called coil.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for ignition coil
an induction coil that supplies the high voltage to the sparking plugs of an internal-combustion engine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012