'barycenter' definitions:

Definition of 'barycenter'

(from WordNet)
noun
(astronomy) the common center of mass around which two or more bodies revolve

Definition of 'barycenter'

From: GCIDE
  • barycenter \barycenter\ n. the point representing the mean position of the matter in a body.
  • Syn: centroid, center of mass. [WordNet 1.5]