primum mobilepri·mum mo·bi·le
Astron. in the Ptolemaic system, the tenth and outermost concentric sphere, revolving from east to west around the earth and causing all celestial bodies to revolve with it
Origin of primum mobileML, first movable thing: see prime, adjective and mobile
- The tenth and outermost concentric sphere of the universe thought in Ptolemaic astronomy to revolve around the earth from east to west in 24 hours and believed to cause the other nine spheres to revolve with it.
- See prime mover.
Origin of primum mobileMedieval Latin prīmum mōbile prīmum neuter of prīmus first mōbile from neuter of mōbilis movable ( translation of Arabic al-muharrik al-'awwal ) ( al- the ) ( muharrik mover ) ( 'awwal first )
Post-classical Latin (from Latin prÄ«mum neuter of prÄ«mus "˜first' + mÅbile, from mobilis "˜mobile'), translating Arabic.