spark gap

noun Electricity.
1.
a space between two electrodes, across which a discharge of electricity may take place.
2.
the electrodes and the space between, considered as a unit: used in ignition systems.

Origin:
1885–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
spark gap
 
n
Sometimes shortened to: gap the space between two electrodes across which a spark can jump

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
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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Example sentences
Typical maintenance involved cleaning the spark plug, adjusting spark gap and adjusting the air-fuel ratio.
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