primum mobile /prīˈməm mōˈbi-lē, mobˈi-lē or prēˈmŭm mōˈbi-le/

1. In medieval astronomy, the outermost of the revolving spheres of the universe, carrying the others round in 24 hours
2. Any great source of motion

• perionychia
• perionychium
• Periophthalmus
• periost
• periostea
• periosteal
• periosteum
• periostites
• periostitic
• periostitis
• periostraca
• periostracum
• periostracums
• periotic
• periotics
• peripatetic
• peripatetical
• peripateticism
• peripateticisms
• peripatetics
• Peripatus
• Peripatuses
• peripeteia
• peripeteian
• peripeteias