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  1. Oxford Dictionary

    crystalline sphere

    • n.
      (in ancient and medieval astronomy) a transparent sphere of the heavens postulated to lie between the fixed stars and the primum mobile and to account for the precession of the equinox and other motions.

    • noun: crystalline sphere, plural noun: crystalline spheres

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    crystalline sphere

    • IPA[ˈkristələn]
    • n.
      (in ancient and medieval astronomy) a transparent sphere of the heavens postulated to lie ...

    Oxford American Dictionary