Meaning of center of symmetry

cen'ter of sym'metry

Pronunciation: [key]
— Crystall. Crystall.
  1. a point within a crystal through which any straight line extends to points on opposite surfaces of the crystal at equal distances. Also calledCf. symmetry element.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.