Searchable Online Version Supplément aux dictionnaires arabes by Reinhart Dozy تكملة المعاجم العربية لرينهارت دوزي

Reinhart Dozy (died 1883 CE) was a Dutch scholar of the Arabic language, history and literature, of French descent. The Supplément took him 40 years to compile. He meant the dictionary as a supplement to more traditional dictionaries of the Arabic langauge, adding precision to such things as the names of plants by giving their (Western) scientific names. It is unique in that he based much of the work on Western orientalist sources, rather than on traditional Arabic dictionaries. Another important distinction is his inclusion of many words from colloquial Arabic, an area of knowledge ignored by traditional scholars of Arabic, and treating such words with the same respect and attention as Standard Arabic words, sometimes without even specificying that the words are non-Standard, a deed akin to heresy in the eyes of many traditionalist scholars of Arabic to this day. His Supplément is an important work for students interested in the Arabic language as it is spoken, which is often vastly different from standard Arabic.