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

Derived forms: pericentres

Encyclopedia: Pericentre