['raundl]
n.
圆形饰物, 小圆盘

Roundel \Roun"del\, n. [OF. rondel a roundelay, F. rondel,
rondeau, a dim. fr. rond; for sense 2, cf. F. rondelle a
round, a round shield. See {Round}, a., and cf. {Rondel},
{Rondelay}.]
1. (Mus.) A rondelay. ``Sung all the roundel lustily.''
--Chaucer.

Come, now a roundel and a fairy song. --Shak.

2. Anything having a round form; a round figure; a circle.

The Spaniards, casting themselves into roundels, . .
. made a flying march to Calais. --Bacon.
※ Specifically:
(a) A small circular shield, sometimes not more than a
foot in diameter, used by soldiers in the fourteenth
and fifteenth centuries.
(b) (Her.) A circular spot; a sharge in the form of a
small circle.
(c) (Fort.) A bastion of a circular form.