from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The point of an orbit around the moon farthest from the moon's center.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The point of an elliptical lunar orbit where the distance between the satellite and the Moon is at its maximum.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. apoapsis in orbit around the moon
apo- + Latin lūna, moon; see lune.(American Heritage® Dictionary of the English Language, Fourth Edition)
From apo- ("far") + Latin lūna ("moon"). (Wiktionary)