apsis: Meaning and Definition of
ap•sis
Pronunciation: (ap'sis), [key] — pl. -si•des
- either of two points in an eccentric orbit, onefarthest from the center of attraction, the othernearest to the center of attraction.
- an apse.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.