roun·del /ˈraʊndḷ/
 圓物;小圓盤;圓形盾
 Roun·del n.
 1. Mus. A rondelay.  “Sung all the roundel lustily.”
    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.
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 roundel
      n 1: English form of rondeau having three triplets with a refrain
           after the first and third
      2: round piece of armor plate that protects the armpit
      3: a charge in the shape of a circle; a hollow roundel [syn: annulet]