barycenter

English Thesaurus

1. (astronomy) the common center of mass around which two or more bodies revolve (noun.location)

hypernym	:	center of mass, centre of mass,
definition	:	point representing the mean position of the matter in a body (noun.location)

domain category	:	astronomy, uranology,
definition	:	the branch of physics that studies celestial bodies and the universe as a whole (noun.cognition)