Arabic and Arabic-English Dictionaries

LingvoSoft Arabic-English Online Dictionary - Bilingual Arabic-English dictionary; site also includes a multilingual dictionary with 25 languages.
Ectaco Online Arabic-English Dictionary - Arabic-English bilingual dictionary; site also includes 21 other languages.
World Star Arabic Online Dictionary - Bilingual Arabic-English dictionary, also includes Persian, Hebrew, Yiddish, Afrikaans, and Swahili dictionaries on the same page.
Qamoose English to Arabic dictionary - QaMoose gives access to an English/Arabic user-defined dictionary via web access using the DICT protocol, meant to assist Arabeyes' translators and technical writers (the dictionary's content comes from the Arabeyes.org Wordlist project).
Dict.info Arabic Dictionaries - A free bilingual dictionary for Arabic and other language combinations. Browsable online, with word searches, and downloadable data files.

 

 

  Arabic Specialized Dictionaries

Dictionarybay Specialized Dictionaries - A number of medical, technical, and other specialized dictionaries in Arabic-English - great repository.
Altibbi - The Arabic Medical Dictionry - Online Arabic medical dictionary and medical reference, with over 20,000 concise definitions of medical terms and terms used in the health sciences, with authoritative descriptions of medical conditions, medications, conventional medical and healing practices, anatomical terms, physiology terms, disease terms, drugs, tests and procedures, noted medical personalities, medical disorders and more. All Arabised and explained in Arabic, with a glossary matching each word with its synonym in English.
ACMLS Medical Dictionaries - Hosts a number of different Arabic medical dictionaries online; very extensive.
Unified Medical Dictionary from World Health Organization - Searchable bilingual Arabic-English medical dictionary database with access to a number of different specialized dictionaries.
Arabic Microfinance Gateway - English-Arabic dictionary of financial terms.
Online Financial Glossary - Searchable, in Arabic-French-English.