Rule 5 accounts for assimilation in certain passive participles of weak-final verbs. The underlying مَفْعُول template and the attested word can differ because weak letters interact and two yāʾ sounds assimilate.
رَمَى → مَرْمِيٌّ — something thrown.
رَضِيَ → مَرْضِيٌّ — one with whom someone is pleased, or one accepted.
The geminated final yāʾ of مَرْمِيٌّ is a morphological outcome, not a decorative shaddah; it reflects substitution and assimilation.
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Rule 5: Yāʾ and Assimilation in Passive Participles
Defective Verbs: Six Iʿlāl Rules and Four Short Paradigms
Rule 5 accounts for assimilation in certain passive participles of weak-final verbs. The underlying مَفْعُول template and the attested word can differ because weak letters interact and two yāʾ sounds assimilate.
رَمَى → مَرْمِيٌّ — something thrown.
رَضِيَ → مَرْضِيٌّ — one with whom someone is pleased, or one accepted.
The geminated final yāʾ of مَرْمِيٌّ is a morphological outcome, not a decorative shaddah; it reflects substitution and assimilation.