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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