JAUHARĪ (Abu Nasr Ismaeil ibn Ḥammad ul-Jauhari) (d. 1002 or 1010), Arabian lexicographer, was born at Fārāb on the borders of Turkestan. He studied language in Fārāb and Bagdad, and later among the Arabs of the desert. He then settled in Damghan and afterwards at Nīshapūr, where he died by a fall from the roof of a house. His great work is the Kitāb us-Ṣaḥāḥ fil-Lugha, an Arabic dictionary, in which the words are arranged alphabetically according to the last letter of the root. He himself had only partially finished the last recension, but the work was completed by his pupil, Abū Isḥaq Ibrāhīm ibn Ṣāliḥ ul-Warrāq.
An edition was begun by E. Scheidius with a Latin translation, but one part only appeared at Harderwijk (1776). The whole has been published at Tebriz (1854) and at Cairo (1865), and many abridgments and Persian translations have appeared; cf. C. Brockelmann, Geschichte der arabischen Literatur (Weimar, 1898), i. 128 seq. (G. W. T.)