Definition of disco ball
: a ball covered with mirrored facets that is usually suspended from a ceiling (as in a nightclub) and that rotates to cast reflected light on surrounding surfaces Every Saturday and Sunday, they make their way to this club, where disco balls glitter and the dance floor is as crowded as a chicken house. — Libby Copeland, Washington Post, 6 July 2003 —called also glitter ball, mirror ball
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First Known Use of disco ball
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