زو 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.

• زُىَّ Form 1

  1 زُىَّ عَلَيْنَا ذ , or زِىَّ, (accord. to different copies of the S, in the TA زُىَّ,) [from زَوٌّ, originally زُوِوَ, then زُوِىَ, and then زُىَّ or زِىَّ,] or it is زُوِىَ, (thus in some copies of the S,) It was decr…

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• زَوٌّ

  زَوٌّ ذ A pair, or couple; two coupled together; (S, K, TA;) [of men, and] of ships and other things; (TA;) i. q. زَوْجٌ: (K, and T in art. تو:) opposed to تَوٌّ meaning “ one, and no more. ” (K, and TA in this art. and …

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