Khalīl’s dictionary, Kitāb al-ʿayn (“Book of the [Letter] ʿAyn”), may have been written in part by his student al-Layth ibn al-Muẓaffar of Khorāsān, who was at one time secretary to the Barmakid viziers of the ʿAbbāsid court. It is arranged according to a novel alphabetical order based…
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