roundel

roun·del  (roundl)

n.

1. A curved form, especially a semicircular panel, window, or recess.

2.

a. A rondel.

b. A rondeau.

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[Middle English, from Old French rondel, diminutive of rond, circle, round; see round¹.]

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roundel

Noun

1. a circular identifying mark on military aircraft

2. a small circular object [Old French rondel little circle]

Thesaurus

Noun	1.	roundel - English form of rondeau having three triplets with a refrain after the first and third rondel, rondeau - a French verse form of 10 or 13 lines running on two rhymes; the opening phrase is repeated as the refrain of the second and third stanzas
	2.	roundel - round piece of armor plate that protects the armpit armor plate, armor plating, armour plate, plate armor, plate armour - specially hardened steel plate used to protect fortifications or vehicles from enemy fire body armor, body armour, cataphract, coat of mail, suit of armor, suit of armour - armor that protects the wearer's whole body
	3.	roundel - (heraldry) a charge in the shape of a circle; "a hollow roundel" annulet armorial bearing, heraldic bearing, bearing, charge - heraldry consisting of a design or image depicted on a shield heraldry - emblem indicating the right of a person to bear arms