1. A hypothetical particle with a single magnetic pole instead of the usual two
   "Despite extensive searches, no magnetic monopole has ever been observed";
   - magnetic monopole
    
2. The spherically-symmetric (uniform) component of any field
   "the cosmic microwave background has a temperature monopole of about 2.7 Kelvin"

Derived forms: monopoles

Type of: particle, subatomic particle

Encyclopedia: Monopole