Some lexical items are treated as singular words but match a صيغة منتهى الجموع form. They are also ghayr munsarif because of their form: طَمَاطِمُ (tomato) and جَمَاشِيرُ (whip). The deciding point is the recognized form, not merely plural meaning.
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Form Can Matter Even Without Plural Meaning
Cause of Ghayr Munsarif: Sighat Muntaha al-Jumu'
Some lexical items are treated as singular words but match a صيغة منتهى الجموع form. They are also ghayr munsarif because of their form: طَمَاطِمُ (tomato) and جَمَاشِيرُ (whip). The deciding point is the recognized form, not merely plural meaning.