CancerWEB - The Online Medical Dictionary [UK]
The OMD is a searchable dictionary created by Dr Graham Dark which contains terms relating to biochemistry, cell biology, chemistry, medicine, molecular biology, physics, plant biology, radiobiology and science & technology. It includes: acronyms, jargon, theory, conventions, standards, institutions, projects, eponyms and history. The dictionary has been growing since early 1997 and now contains over 46,000 definitions. Entries are cross-referenced to each other and to additional web-based resources.

Glossary of HIV / AIDS related terms [USA]
The HIV/AIDS Treatment Information Service (ATIS) has produced the fourth edition (2002) of the Glossary of HIV/AIDS-Related Terms. The glossary has been updated to include new terms and updates to existing terms. Also available in PDF format.

MedTerms.com- Dictionary [USA]
A dictionary produced by MedicineNet, Inc. an online, healthcare media publishing company. The dictionary forms part of the MedicineNet.com portal which provides easy-to-read, in-depth, authoritative medical information for healthacre providers and consumers.

Multilingual Glossary of technical and popular medical terms [European Commission]
The project incorporates nine European languages, was commissioned by The EuropeanCommission (DG III) and executed by Heymans Institute of Pharmacology and Mercator School, Department of applied Linguistics.

Street Terms [USA]
The Street Terms database contains over 2,300 street terms that refer to specific drug types or drug activity.

whonamedit.com [Norway]
Whonamedit.com is a biographical dictionary of medical eponyms.