Bandeau definitions

băn-dō'
A narrow band for the hair.
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A garment consisting of a band of fabric that covers the bust, sometimes having removable straps.
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A usually strapless brassiere.
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A narrow ribbon, esp. one worn around the head to hold the hair in place.
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A band of material covering the breasts, as a strapless bikini top.
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A band for the hair.

She wore a bandeau in her hair.

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(medicine) A band.
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A brassiere, especially when narrow or strapless; a top made from a narrow band of fabric.
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Origin of bandeau

French from Old French bandel diminutive of bande band, strip band1