roundel

/ˈraʊndəl/
noun
  1. A small circular object, shape, or design, especially a decorative disk or medallion.
    • The old church had a beautiful stained-glass roundel in its window.
    • She wore a necklace with a silver roundel engraved with flowers.
    • The carpet featured a pattern of colorful roundels in the center.
  2. A circular identifying mark on military aircraft, showing nationality.
    • The museum displayed a vintage plane with its original roundel still visible.
    • The fighter jet had a red, white, and blue roundel on its wing.
    • Aviation enthusiasts can identify a plane's country by its roundel.
  3. A short poem consisting of three stanzas, often with a refrain.
    • He wrote a roundel for his friend's birthday, repeating the first line at the end.
    • In literature class, they studied the structure of a roundel.
    • The poet composed a roundel about the changing seasons.