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Noun: barycentre
Usage: Brit, Cdn (US: barycenter)
  1. (astronomy) the common centre of mass around which two or more bodies revolve
    "The barycentre of the Earth-Moon system is located within the Earth";
    - barycenter [US]

Derived forms: barycentres

Type of: center of mass [US], centre of mass [Brit, Cdn]

Encyclopedia: Barycentre