Abū’l-Ḥasan ʻAlī ibn Ismāʻīl (أبو الحسن على بن اسماعيل), known as Ibn Sīdah (ابن سيده), or Ibn Sīdah'l-Mursī (ابن سيده المرسي), (c.1007-1066), was a linguist, philologist and lexicographer of Classical Arabic from Andalusia. He compiled the encyclopedia al-Kitāb al-Mukhaṣṣaṣ (المخصص) (Book of Customs) and the Arabic-language dictionary Al-Muḥkam wa-al-muḥīt al-aʻẓam (المحكم والمحيط الأعظم) ("the great and comprehensive arbiter"). His contributions to language, literature, and logic were considerable.
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