Dictionary
ap•as•tron
Pronunciation: (u-pas'trun, -tron), [key]—
n.,
—pl. -traPronunciation: (-tru). [key]
Astron.
the point at which the stars of a binary system are farthest apart (opposed to
periastron).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.