primum mobile

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

Definition of primum mobile


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 and Etymology of primum mobile

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

First Known Use: 15th century

Seen and Heard

What made you want to look up primum mobile? Please tell us where you read or heard it (including the quote, if possible).