apsis

Science Dictionary
apsis  [%PREMIUM_LINK%]     (āp'sĭs)  Pronunciation Key 
Plural apsides (āp'sĭ-dēz')
In the path of an orbiting body, either of the two points at which it is closest to or farthest away from the body it is orbiting. See also apoapsis, periapsis.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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