A doubled triliteral has identical second and third radicals. Analysis begins with three positions on the root pattern, even when the normal spoken or written form merges two consonants.
مَدَدَ → مَدَّ — the underlying two dāls are assimilated in the familiar form.
رَدَدَ → رَدَّ — a comparable assimilation of the repeated final radicals.
These unassimilated spellings clarify the underlying structure; the actual ordinary perfect forms are the assimilated ones. A shaddah does not reduce the count of root radicals.
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Doubled Triliteral Roots
The Seven Morphological Classes: Sound, Hamzated, Weak and Doubled
A doubled triliteral has identical second and third radicals. Analysis begins with three positions on the root pattern, even when the normal spoken or written form merges two consonants.
مَدَدَ → مَدَّ — the underlying two dāls are assimilated in the familiar form.
رَدَدَ → رَدَّ — a comparable assimilation of the repeated final radicals.
These unassimilated spellings clarify the underlying structure; the actual ordinary perfect forms are the assimilated ones. A shaddah does not reduce the count of root radicals.