جونة doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• جَوْنَةٌ

  جَوْنَةٌ جون جونه جونة The sun; (K;) [i. e.] the sun's disc; because it becomes black [or of a blackish colour tinged with red] at setting; (S;) or it may be because of its whiteness and clearness; but it is said to be o…

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• جُونَةٌ

  جُونَةٌ جون جونه جونة The quality [i. e. colour], in horses, denoted by [the epithet] جَوْنٌ; like غُبْسةٌ and دُهْمَةٌ; (S;) in horses, i. q. جَوْنَةٌ: (K:) and in the sun, also, the quality denoted by جَوْنَةٌ [as fem.…

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