Dictionary
a•phe•li•on
Pronunciation: (u-fē'lē-un, u-fēl'yun, ap-hē'lē-un), [key]—
n.,
—pl. a•phe•li•aPronunciation: (u-fē'lē-u, u-fēl'yu, ap-hē'lē-u). [key]
Astron.the point in the orbit of a planet or a comet at which it is farthest from the sun. Cf.
perihelion.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.