rondelle

[ron-del]
noun
  1. a small disk of glass used as an ornament in a stained-glass window.
  2. Jewelry. a flat bead, often of rock crystal or onyx, used in a necklace as a spacer between contrasting stones.

Origin of rondelle

From French, dating back to 1830–40; see origin at rondel
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of rondelle