From the eighth to the tenth century A.D., Greek scientific and philosophical works were translated wholesale into Arabic. A Greek and Arabic Lexicon is the first systematic attempt to present in an analytical, rationalized way our knowledge of the vocabulary of these translations. It is an indispensable reference tool for the study and understanding of Arabic scientific and philosophical language and literature, and for the knowledge of the vocabulary of Classical and Middle Greek and the reception and reading of classical Greek works in late antiquity and pre-Photian Byzantine literature.