طهو 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.

• طَهَا Form 1

  1 طَهَا ذ , aor. يَطْهُو and يَطْهَى, inf. n. طَهْوٌ (S, K) and طُهُوٌّ (K) and طَهْىٌ, (S, [so in both of my copies,]) or طُهِىٌّ, (K,) and طَهَايَةٌ, thus app. accord. to the K, [and thus in my MS. copy and in the CK,)…

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• طَهْوٌ

  طَهْوٌ ذ [The cooking of flesh-meat: see 1, first sentence. -b2- And hence,] (assumed tropical:) A deed, or a performance. (S, K, TA.) Thus in a trad., (S, TA,) in which it is related that it was said to Aboo-Hureyreh, “…

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