roundel
/ˈraʊndəl/noun
1
- a small disc, especially a decorative medallion小圆板, 小圆盘; 圆形装饰板（尤指装饰性的圆雕饰）。
1.1
- a picture or pattern contained in a circle圆形物内的照片（或图案）。
1.2
- Heraldry a plain filled circle as a charge (often with a special name according to colour)【纹章】圆形纹章。
1.3
- a circular identifying mark painted on military aircraft, as, for example, the red, white, and blue of the RAF（喷涂在军用飞机上的）圆形标记（例如英国皇家空军飞机上的红、白、蓝标志）。
2
- a short poem consisting of three stanzas of three lines each, rhyming alternately, with the opening words repeated as a refrain after the first and third stanzas. The form, a variant of the rondeau, was developed by Swinburne.英国式回旋体诗（三节三行短诗, 交替押韵, 开头部分在第一和第三节后用作叠句, 为回旋诗的变体, 由斯温伯恩发展而成）。
词源
Middle English: from Old French rondel, from ro(u)-nd- （see ROUND）.