طشة 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.

• طُشَّةٌ

  طُشَّةٌ ذ and , both with damm, A malady like the [rheum termed] زُكَام, (O, K,) incident to human beings: said by El-Kutabee to be termed طُشَّة because when he who is affected with it blows his nose he sprinkles the mo…

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• طِشَّة

  طِشَّة ذ is said in the K to signify A young child; its author having app. understood a young child to be meant thereby in a trad. respecting the [plant called] حَزَاة, in which it is said, يَشْتَرِيهَا أَكَايِيسُ الصِّب…

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