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

Derived forms: barycenters

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

Encyclopedia: Barycenter