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spark gap

noun, Electricity.
a space between two electrodes, across which a discharge of electricity may take place.
the electrodes and the space between, considered as a unit: used in ignition systems.
Origin of spark gap
1885-90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for spark-gap

spark gap

the space between two electrodes across which a spark can jump Sometimes shortened to gap
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
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spark-gap in Science
spark gap  
A gap in an otherwise closed electric circuit across which a discharge occurs at a prescribed voltage. The discharge often causes ionization of the surrounding gas and thereby very high temperatures, and can be exploited, as in spark plugs, to ignite engine fuel in a combustion chamber.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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