ثندؤة doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• ثُنْدُؤَةٌ

  ثُنْدُؤَةٌ ذ and ثَنْدُؤَةٌ, (M,) or ثَنْدُوَةٌ, (Lth, T,) or ثُنْدُوَةٌ, of the measure فُنْعُلَةٌ, with damm to the ف and ع, or, accord. to some, the ن is radical and the و augmentative, the measure being فُعْلُوَةٌ, (…

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