Grammar term · I'rab · i'rab
مَمْنُوع مِنَ الصَّرْف
mamnu' min al-sarf
Diptote (banned from tanwin)
I'rab · i'rabI'rab marker (alama)core term391+ in the Qur'an
In one line
The diptote — a noun that refuses tanwin and shows jarr with a fatha.
Classical definition
المَمْنُوعُ مِنَ الصَّرْفِ اسْمٌ لَا يَقْبَلُ التَّنْوِينَ، يُرْفَعُ بِالضَّمَّةِ وَيُنْصَبُ وَيُجَرُّ بِالفَتْحَةِ نِيَابَةً عَنِ الكَسْرَةِ.
“The diptote is a noun that does not accept tanwin; it takes raf' with damma, and nasb and jarr with fatha standing in for kasra.”
(بتصرف من الألفية)
Key words in the Arabic
لَا يَقْبَلُ التَّنْوِينَdoes not accept tanwin
نِيَابَةً عَنْstanding in for
Understand it
A closed club of nouns declines on two vowels instead of three: many proper names (إِبْرَاهِيم، مَكَّة), plural patterns like مَسَاجِد and مَصَابِيح, colours and comparatives like أَحْمَر and أَكْبَر. You spot them by what is absent — no tanwin ever, and بِمَسَاجِدَ where you expected a kasra. With ال or in idafa they recover the normal kasra: فِي الْمَسَاجِدِ.
How to spot it
Recognition test
No tanwin though indefinite, and a fatha where jarr should be — a diptote.
Related terms