Definition of orb noun from the Oxford Advanced American Dictionary

     

    orb

     noun
    noun
    NAmE//ɔrb//
     
     
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  1. 1(literary) an object shaped like a ball, especially the sun or moon The red orb of the sun sank beneath the horizon.
  2. 2a gold ball with a cross on top, carried by a king or queen at formal ceremonies as a symbol of power compare scepter
See the Oxford Advanced Learner's Dictionary entry: orb