aphelion

a·phe·li·on Audio Help (ə-fē'lē-ən, ə-fēl'yən)

n. pl. a·phe·li·a (-lē-ə)
The point on the orbit of a celestial body that is farthest from the sun.

[From New Latin aphēlium : Greek apo-, apo- + Greek hēlios, sun; see sāwel- in Indo-European roots.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
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