عى 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.

• عَىَّ Form 1

  1 عَىَّ بِأَمْرِهِ ذ , (S,) or بِالأَمْرِ, (MA, Msb, K,) and عَن الأَمْرِ, (MA,) and الأَمْرَ also, (MA, and Ham p. 717,) and عَيِىَ, (S, Msb, K,) [which is the original form,] but عَىَّ is more common, (S, TA,) and أَعْ…

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• عَىٌّ

  عَىٌّ ذ and , (S, Msb, K, TA,) the former of which is the more common, (TA,) are epithets denoting the agent of the verb in the phrases عَىٌّ بِالأَمْرِ (Msb, K) and عَىَّ عَنْ حُجَّتِهِ (Msb) and عَىَّ فِى مَنْطِقِهِ: […

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