وَصِيغَتُهُ مِنْ مُجَرَّدِ الثُّلَاثِيِّ عَلَى وَزْنِ «مَفْعُولٍ».
Source: From a regular Form-I triliteral, the passive participle follows the mafʿūl pattern: maḍrūb, maktūb, manṣūr.
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Form I Passive Pattern
Ism al-Mafʿūl: Formation, Weak Roots and Government
وَصِيغَتُهُ مِنْ مُجَرَّدِ الثُّلَاثِيِّ عَلَى وَزْنِ «مَفْعُولٍ».
Source: From a regular Form-I triliteral, the passive participle follows the mafʿūl pattern: maḍrūb, maktūb, manṣūr.