Definition from Wiktionary, the free dictionary
- (linguistics) One of fourteen Arabic letters that cause the "L" of a preceding definite article to be assimilated in pronunciation. The sun letter suppresses the sound of the "L" and then geminates: al + ṣīn = aṣ-ṣīn. The effect of the sun letter is limited to pronunciation and does not affect the spelling, except that a shadda may be written over the sun letter and in the fully vocalised spelling lām lacks any diacritics: الصِّين (aṣ-ṣīn). The fourteen sun letters are:
- In Moroccan and Levantine Arabic, ج (j) is also considered a sun letter, and assimilates with the definite article, as it is pronounced /ʒ/, not /dʒ/.