Rule 1 states that an alif preceded by ḍamma changes to wāw in the described derived pattern. The examples are broken plurals; do not treat this as an unrestricted rule for every alif.
خَادِعٌ → خَوَادِعُ
Translation: One who deceives → a plural form.
خَالِدٌ → خَوَالِدُ
Translation: One who remains → a plural form.
The focus is vowel-conditioned replacement of alif by wāw, not deletion of an original root letter.
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Rule 1: Alif Becomes Wāw After Ḍamma
Miscellaneous Morphological Explanations: Eight Rules for Wāw, Yāʾ, Alif and Hamzah
Rule 1 states that an alif preceded by ḍamma changes to wāw in the described derived pattern. The examples are broken plurals; do not treat this as an unrestricted rule for every alif.
خَادِعٌ → خَوَادِعُ
Translation: One who deceives → a plural form.
خَالِدٌ → خَوَالِدُ
Translation: One who remains → a plural form.
The focus is vowel-conditioned replacement of alif by wāw, not deletion of an original root letter.