The term “diptote” is composed of “di” meaning “two” (and sometimes a “princess”) and “tote” which I believe is a kind of umbrella. Diptotes have long posed a problem for the student whose teacher insists on correct vocalization of every word in a text. The problem arises both because diptotes only show two cases when they are indefinite and because students do not know how to spot a diptote. (See note 1 below)
Here is everything you will ever need to know about them.
When a diptote is indefinite it will not have nunation. مَصادرُ “sources” is a diptote. It will only have one dhamma even when indefinite. If the word is accusative it will have one fatha as in مصادرَ If the word is genitive it will not have a kasra. It will still take a FATHA. For example منْ مصادرَ “from sources.” Do you like this? It gets better.
If a diptote is made definite, it will show all three cases in a regular way: المصادرَ , المصادرِ, المصادرُ. So a diptote is regular when it is definite. (That is, it becomes a triptote – I am not kidding.)
In addition, when a diptote is any term except the last term of any idaafa it will always have regular case endings. It does not matter whether or not the idaafa is definite or indefinite. For example مكاتبُ, is a diptote meaning “offices.” Look at its case in the two sentences below.
|1. We were in the offices of the big shots.||
١. كنا في مكاتبِ الموظفين الكبار.
|2. We were in offices of big shots.||
٢. كنا في مكاتبِ موظفين كبار.
In both sentences مكاتب has a kasra since it is in an idaafa but it is not the last term of the idaafa.
If the diptote is the last term in the idaafa it will have regular case endings if it is definite. What “regular case endings” means is that the diptote will have a kasra, since the only case for the last term of an idaafa is the genitive. For example, قائمةُ المصادرِ “the list of sources.”
However, if the diptote is the last term of an indefinite idaafa then it will behave just as it does when it is indefinite and not in an idaafa – it will have one fatha to show that it is in the genitive case. For example قائمةُ مصادرَ “a list of sources.”
Here is the run down once more:
1. Whenever a diptote is definite, it takes regular case endings.
2. When a diptote is in a definite or indefinite idaafa, but is not the last term of the idaafa, it takes regular case endings.
3. When a diptote is the last term of idaafa, it will be regular if it is definite (it will take a kasra), but it will take a fatha if it is indefinite.
4. When a diptote is indefinite and not in an idaafa, it never has nunation. It takes one dhamma for nominative and one fatha for both the accusative and genitive cases.
The next issue you must face with respect to these words is: Would you know a diptote if it walked up and introduced itself? The answer is no. So how do you know a diptote when you see one? There are a number of categories of words which are diptotes. I will talk about the major ones here.
There are certain patterns of broken plurals which are diptotic patterns. The chief one is the plural pattern for place nouns. متحفٌ , مكتبٌ and even مدرسةٌ are place nouns. Their plurals are متاحفُ , مكاتبُ and مدارسُ. All place-noun plurals are diptotes.
Another pattern which is diptotic is represented by the plural of عاملٌ (“factor”). The plural is عَوامِلُ. Here you have the long vowel alif before the second radical and a kasra on the second radical (just as you do with place noun plurals). Usually this pattern of alif before the second radical and a kasra underneath the second radical gives a diptote.
The plural of فريضة (“obligation”) is فرائضُ . Here a hamza is inserted between the alif and the last radical. When this happens you have a diptote.
اسابيعُ ,the plural of أُسبوعٌ is a diptote. Here we have a pattern of alif, second radical, and a yaa’ (instead of a kasra). This pattern is also diptotic.
Another diptotic pattern occurs when an alif and a hamza are added to the end of the plural form. For example, the plural of رئيس is رُؤَساء Here the alif comes after the last radical of the word and is followed by a hamza with no seat. Note that neither the alif nor the final hamza represent one of the radicals of the word رئيس When this happens you have a diptote.
On the other hand, the singular noun بناءٌ is not a diptote. The alif represents the weak final radical. The plurals أَسماءٌ and أبْناءٌ are also not diptotes. The alif at the end of these two plural words represents a i fnal weak radical in the root of each word.
The masculine plural of the elative is also a diptote. The pattern is أفاعِلُ . For example, the plural of أكبرُ is أكابِرُ. Note that the plural has the pattern of alif , second radical, and kasra.
These are the most common broken plural patterns which result in diptotes.
Singular Nouns and Adjectives
The most common diptotic pattern for singular words in the elative pattern – أكْرَمُ , أكْبَرُ etc. Of course, since the elative often occurs at the beginning of an idaafa, you will often see it taking regular case endings.
Some adjectives end in ان as in عَطْشانُ (“thirsty”) and غَضْبانٌ (“angry”) . These words are diptotes.
All feminine,personal names are diptotes. Therefore even if a woman’s name is كريمةُ the word will be a diptote. If كريمةٌ is used as a regular adjective, it will take are regular case endings.
All place names are diptotes unless they have the definite article or end in the feminine sound plural اتٌ. Thus مصرُ and دمشقُ are diptotes. However, الاردنُ It and السودانُ will take case endings the way any definite word does.
Masculine personal names are usually diptotes. However, if the name happens to be a regular noun or adjective it will be regular with respect to case (unlike the situation for feminine names). For example, فَريدٌ is a common man’s name. It is also a regular adjectival pattern. Therefore, it takes normal case endings. (Note that the rule here is the opposite from the rule for feminine personal names, since all feminine personal names are diptotes no matter what.)
Masculine personal names with only three letters and which have a sukuun on the second letter take regular case endings. Thus زَيْدٌ and نوحُ are regular nouns with respect to case. However, إبراهيمُ , آدّمُ and يوسُّفُ are diptotes.
Many teachers do not lay stress on the case endings for proper names due to the difficulty of remembering all the rules regarding them. Personally, I agree with that policy. However, you should be aware of the rules regarding common nouns and adjectives which are diptotes.
Note 1 – Throughout this chapter, I am relying on the definitions of terms such as “diptote” and “indeclinable” as they are used in EMSA, volumes I and II. EMSA’s definition of these terms is not always standard, but it does impress me as the most accessible. To see a more classical based set of definitions and descriptions of these terms, see Chapter 44 of Haywood/Nahmad, entitled “Declension of the Noun.”