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guard ring

a ring worn tightly in front of another ring to prevent the latter from slipping off the finger.
Origin of guard ring
1810-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for guard ring
  • 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.
British Dictionary definitions for guard ring

guard ring

(jewellery) Also called guard, keeper ring. an extra ring worn to prevent another from slipping off the finger
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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