The Dictionary of Modern Written Arabic by Hans Wehr is widely regarded as the foremost Arabic-English bilingual or translation dictionary and has particular usefulness for students of Modern Standard Arabic. The morphology and syntax of written Arabic is essentially the same in all Arabic countries. Unlike many other Arabic-English dictionaries, it arranges each Arabic word according to its consonantal root. Foreign words are listed in straight alphabetical order by first letter (in the Arabic script). Arabicized loanwords, if they can clearly fit under some root, are entered both ways, often with the root entry giving reference to the alphabetical listing.
Volume 1 of 2: Arabic-English Dictionary The Hans Wehr Dictionary of Modern Written Arabic. Fourth Edition.