apocenter

from The Century Dictionary.

• noun In the orbit of a heavenly body, the point most distant from the body or point around which it revolves.
• noun In biology, an organism or organ which may be regarded as a specialized or divergent descendant from a more primitive or less specialized organism or organ.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun astronomy The furthest point of an astronomical object in an elliptical orbit to its center of attraction (the principal focus of the ellipse)