عائر 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.

• عَائِرٌ

  عَائِرٌ ذ Anything that causes disease in the eye, (K, TA,) and wounds: so called because the eye becomes closed on account of it, and the person cannot see, the eye being as it were blinded: (TA:) ophthalmia; syn. رَمَد…

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• عَائِرٌ

  عَائِرٌ ذ That goes to and fro, and round about; as also : both are applied [to a man and] also to a dog: (TA:) and ↓ the latter is also expl. as follows: a man (TA) often coming and going (K, TA) in the land: (TA:) ofte…

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