● If the noun used as a muḍāf is dual or sound masculine plural, its final nūn must be dropped to lighten its ending:
NominativeAccusative and genitiveType
كِتَابَا (original: كِتَابَانِ)كِتَابَيْ (original: كِتَابَيْنِ)Masculine dual
يَدَا (original: يَدَانِ)يَدَيْ (original: يَدَيْنِ)Feminine dual
بَنُو (original: بَنُونَ)بَنِي (original: بَنِينَ)Sound masculine plural
● For example, 'the boy's two hands' -> يَدَا الْوَلَدِ; the nūn of يَدَانِ is dropped.
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Rules and Spelling Principles of the Iḍāfah
● If the noun used as a muḍāf is dual or sound masculine plural, its final nūn must be dropped to lighten its ending:
NominativeAccusative and genitiveType
كِتَابَا (original: كِتَابَانِ)كِتَابَيْ (original: كِتَابَيْنِ)Masculine dual
يَدَا (original: يَدَانِ)يَدَيْ (original: يَدَيْنِ)Feminine dual
بَنُو (original: بَنُونَ)بَنِي (original: بَنِينَ)Sound masculine plural
● For example, 'the boy's two hands' -> يَدَا الْوَلَدِ; the nūn of يَدَانِ is dropped.