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A Mimosa is a cocktail-like drink composed of one part champagne (or other sparkling wine) and one part thoroughly chilled citrus fruit juice, usually orange juice unless otherwise specified (e.g. "grapefruit [juice] mimosa"). It is traditionally served in a tall champagne flute with a morning brunch as hair of the dog or to guests at weddings.
It is probably named after the French name for the yellow flowers of Acacia dealbata.
A Buck's Fizz is a similar cocktail, but with twice as much orange juice as champagne.