WordReference Random House Unabridged Dictionary of American English © 2020
ap•o•lune  (apə lo̅o̅n′),USA pronunciation n. [Aerospace.]
  1. Aerospace, Astronomythe point in a lunar orbit that is farthest from the moon. Cf. perilune.
  • Latin lūna moon, on the model of apogee, etc.
  • apo- + -lune 1965–70

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