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disco ball noun

  /ˈdɪskoʊ ˌbɑːl/ , /ˈdɪskoʊ ˌbɔːl/ , /ˈdɪskəʊ ˌbɔːl/
  • A suspended rotating mirrored sphere which casts moving spots of light across a room when light is projected on it.
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