Rule
When followed by a sun letter, the l of the Arabic definite article al- assimilates to the initial consonant of the following noun, resulting in a doubled consonant. For example, for "the Nile", one does not say al-Nīl, but an-Nīl. When the definite article is followed by a moon letter, no assimilation takes place.
Sun letters represent all coronal consonants except ج ǧīm (see below). Since the article al- ends in a coronal consonant, it lends itself to assimilation with these sounds.
The sun and moon letters are as follows:
Sun letters | ﺕ | ﺙ | ﺩ | ﺫ | ﺭ | ﺯ | ﺱ | ﺵ | ﺹ | ﺽ | ﻁ | ﻅ | ﻝ | ﻥ |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
t | ṯ | d | ḏ | r | z | s | š | ṣ | ḍ | ṭ | ẓ | l | n | |
Moon letters | ء | ﺏ | ﺝ | ﺡ | ﺥ | ﻉ | ﻍ | ﻑ | ﻕ | ﻙ | ﻡ | ﻭ | ﻱ | ه |
ʾ | b | ǧ | ḥ | ḫ | ʿ | ġ | f | q | k | m | w | y | h |
Read more about this topic: Sun And Moon Letters
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