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  1. Oxford Dictionary

    armillary sphere

    • IPA[ɑːˌmɪl(ə)rɪ ˈsfɪə]

    英式

    • n.
      a model of the celestial globe constructed from rings and hoops representing the equator, the tropics, and other celestial circles, and able to revolve on its axis.

    • noun: armillary sphere, plural noun: armillary spheres