Though it is for arabics, It is also useful for English speaking peoples. It dispalys images for the medical terms (if the medical term is possible to describe through images)
The Unified Medical Dictionary (UMD) is a Multilingual Medical Dictionary, which was originally compiled in the late 1960s and early 1970s on response to a recommendation of the Arab Medical Union. Subsequently, two further editions were issued, the last of which (UMD third edition, 1983) included French terms.
The Council of Arab Health Ministers then asked WHO/EMRO to update the previous edition. An editorial committee of experts was set up with Dr M.H. Khayat as the rapporteur to further verify and enrich the Unified Medical Dictionary on a regular basis. In the late 1980s Dr Khayat took the initiative to prepare a fourth comprehensive edition covering the widest range possible of medical terminology to be made available for users.
Dr Khayat coordinated the work with a selected team of experts from almost all the Arab countries. The team made use of feedback, comments and information received from a long list of experts and professionals from all over the Arab world.
An electronic version of this edition is available on CD-ROM in a Windows environment, and comprises about 150 000 terms.
The computerized version enabled the UMD team to isolate specialized sub-dictionaries from the mother UMD easily. As a result, great progress has been achieved in the production of the hardcopy version of the Unified Medical Dictionary (UMD) with UMD-driven sub-dictionaries: the Unified Dentistry Dictionary (UDD), Unified Pharmacy Dictionary (UPD), Unified Anatomy Dictionary (UAD) and Unified Medical Dictionary, Pocket version (UMDP).
This is the online dictioary
http://www.emro.who.int/umd/

Size: 532 MB
http://www.zshare.net/download/umd1-part1-rar.html
http://www.zshare.net/download/umd1-part2-rar.html
http://www.zshare.net/download/umd1-part3-rar.html
http://www.zshare.net/download/umd1-part4-rar.html
http://www.zshare.net/download/umd1-part5-rar.html
http://www.zshare.net/download/umd1-part6-rar.html
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