primum mobile

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

Definition of primum mobile 

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

First Known Use of primum mobile

15th century, in the meaning defined above

History and Etymology for primum mobile

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

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The first known use of primum mobile was in the 15th century

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