crystalline sphere
- (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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- IPA[ˈkristələn]
- (in ancient and medieval astronomy) a transparent sphere of the heavens postulated to lie ...
Oxford American Dictionary