وَهُوَ أَنْ يَكُونَ بَعْدَ أَلِفِ الْجَمْعِ حَرْفَانِ، كَـ«مَسَاجِدَ».
Translation: One form has two letters after the plural alif, as in masājid.
In مَسَاجِد, the plural alif is ا and is followed by ج، د. Its position and the following letters matter; the mere presence of an alif does not establish the pattern.
| Word | Meaning |
|---|---|
| مَسْجِدٌ | Singular: mosque |
| مَسَاجِدُ | A plural of the specified pattern |