A broken plural changes the internal shape of the singular, as in كِتَابٌ ← كُتُبٌ and مَسْجِدٌ ← مَسَاجِدُ.
كُتُبٌ is a broken plural, but does not follow the ultimate-plural pattern defined in the book, and remains fully declinable.
مَسَاجِدُ is both a broken plural and one of the specified patterns; it is therefore a diptote.
| Word | Meaning |
|---|---|
| كُتُبٌ | Broken plural, fully declinable |
| مَسَاجِدُ | Broken plural, diptote |