seal ring

noun
a finger ring bearing an incised design for embossing a wax seal.

Origin:
1600–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
seal ring
 
n
another term for signet ring

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 buoyancy compensator seal ring could crack, posing a drowning hazard to
  divers.
The original slide gate is removed to allow the drop gate to seat over the seal
  ring.
Both have the common attribute of a lapped seal face between a stationary
  element and a rotating seal ring.
Initially, gate sealing on the sewer invert was provided by a closed cell foam
  seal ring attached to the contour fitted gate.
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