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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.

guard ring

noun

  1. Also calledguardkeeper 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
“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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Word History and Origins

Origin of guard ring1

First recorded in 1810–20

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guardrailguardroom

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