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primum mobile

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noun pri·mum mo·bi·le \ˈprī-məm-ˈmō-bə-lē, ˈprē-\

Definition of primum mobile

plural primum mobiles

  1. :  the outermost concentric sphere conceived in medieval astronomy as carrying the spheres of the fixed stars and the planets in its daily revolution



Origin of primum mobile

Middle English, from Medieval Latin, literally, first moving thing


First Known Use: 15th century


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