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Noun: pericenter  'pe-ri,sen-tur
Usage: US (elsewhere: pericentre)
  1. (astronomy) the point in the orbit of one body of a binary system at which it is closest to the center of mass of the system
    "The comet's velocity increased as it approached its pericenter";
    - pericentre [Brit, Cdn]

Derived forms: pericenters

Encyclopedia: Pericenter