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guard ring

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

First recorded in 1810–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for guard ring

guard ring

noun
  1. Also called: guard, keeper ring jewellery 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
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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