'' () is one of the six letters the
Arabic alphabet added to the twenty-two inherited from the
Phoenician alphabet (the others being , , , , ). It represents an
emphatic voiced alveolar plosive (). In name and shape, it is a variant of . Based on ancient descriptions of this sound, it appears to have represented in
Qur'anic Arabic a
pharyngealized voiced alveolar lateral fricative (It is said that
Muhammad pronounced it with both sides of his tongue)
[1]. This is an extremely unusual sound, and led the early Arabic grammarians to describe
Arabic as the "language of the ", since the sound was thought to be unique to Arabic.
South Semitic, however, also continues the phoneme, as
South Arabian 
ḍ
, and
Ge'ez ''
ፀ (also transliterated ).
Ḍād is written is several ways depending in its position in the word:
In some reconstructions of
Proto-Semitic phonology, there is an
emphatic voiceless alveolar lateral fricative, (), featuring as the direct ancestor of Arabic , while merging with in most other Semitic languages.
See also
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Ll Welsh voiceless lateral fricative
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Arabic phonology
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Ḍ
Sources
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Lateral Fricatives Worldwide and in Africa