رِدَاءٌ ← رِدَاءَانِ / رِدَاوَانِ
Ridāʾ has hamzah substituted for original yāʾ.
The source permits ridāʾāni and ridāwāni in the dual.
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Another Substituted Hamzah
The Dual Noun: Inflection, Maqṣūr, Mamdūd and Iḍāfah
رِدَاءٌ ← رِدَاءَانِ / رِدَاوَانِ
Ridāʾ has hamzah substituted for original yāʾ.
The source permits ridāʾāni and ridāwāni in the dual.