roundel

[roun-dl]
noun
1.
something round or circular.
2.
a small, round pane or window.
3.
a decorative plate, panel, tablet, or the like, round in form.
4.
Also, rondel. Theater. a round piece of colored gelatin or glass placed over stage lights as a color medium to obtain lighting effects.
5.
Armor.
a.
a metal disk that protects the armpit.
b.
a metal disk on a hafted weapon or a dagger to protect the hand.
6.
Heraldry. a small circular charge.
7.
Prosody.
a.
a rondel or rondeau.
b.
a modification of the rondeau, consisting of nine lines with two refrains.
8.
a round dance.

Origin:
1250–1300; Middle English roundele, rundel(le) < Old French rondel, derivative of rond round1 (adj.)

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World English Dictionary
roundel (ˈraʊndəl)
 
n
1.  a form of rondeau consisting of three stanzas each of three lines with a refrain after the first and the third
2.  a circular identifying mark in national colours on military aircraft
3.  a small ornamental circular window, panel, medallion, plate, disc, etc
4.  a round plate of armour used to protect the armpit
5.  heraldry a charge in the shape of a circle
6.  another word for roundelay
 
[C13: from Old French rondel a little circle; see rondel]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Below a blind roundel in the attic, a round-headed window rose almost two full stories above the pedimented entrance.
Fenestration of the tower is completed with a roundel, containing spoke tracery, above the triple window.
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