guard ring

a ring worn tightly in front of another ring to prevent the latter from slipping off the finger.

1810–20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
guard ring
1.  jewellery guard, Also called: keeper ring an extra ring worn to prevent another from slipping off the finger
2.  an electrode used to counteract distortion of the electric fields at the edges of other electrodes in a capacitor or electron lens

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The guard ring is also included at the same voltage as the sensing plate in order to reduce fringe effects.
For minimal edge-effect field disturbance, a guard ring is generally placed around the upper plate.
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