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Meaning of pericenter

per•i•cen•ter

Pronunciation: (per'u-sen"tur), [key]
— n. Astron.
  1. the point at which a heavenly body orbiting around a primary other than the earth or sun is closest to the primary. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.