رئبال 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.

• رِئْبَالٌ

  رِئْبَالٌ ذ , a quadriliteral word [as to its root], (M, K,) of the measure فِعْلَالٌ, as is shown by their saying تَرَأْبَلُوا; (M;) and also without ء, (M, K,) sometimes, (K,) the ء being suppressed, and ى substituted …

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