In an unaugmented quadriliteral, all four radical positions belong to the root: دَحْرَجَ has d–ḥ–r–j. In a mulḥaq form, a triliteral receives an extra formative element and comes to resemble an established quadriliteral pattern.
These are distinct morphological analyses even when the surface forms have similar lengths. A word with four pronounced consonants is not automatically a genuine four-radical root.
The root identifies the original radicals; the pattern describes the full morphological arrangement.
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A true quadriliteral versus an assimilated triliteral
Mulḥaq bi-Rubāʿī: Definition, Two Groups and Nine Patterns
In an unaugmented quadriliteral, all four radical positions belong to the root: دَحْرَجَ has d–ḥ–r–j. In a mulḥaq form, a triliteral receives an extra formative element and comes to resemble an established quadriliteral pattern.
These are distinct morphological analyses even when the surface forms have similar lengths. A word with four pronounced consonants is not automatically a genuine four-radical root.
The root identifies the original radicals; the pattern describes the full morphological arrangement.