The On-line Medical Dictionary:

This excellent medical reference is a subset of the CancerWEB Project. CancerWEB is a multimedia information resource for oncology, based in the UK, and is available free of charge to anyone with access to the Internet

This is a must for any user utilizing any other medical website including simplistic definitions of medical nomenclature and taxonomy. This site also readily links to other useful reference sites including Webster's English Dictionary, Roget's Thesaurus, Dictionary of Scientific Terms, Dictionary of Cell Biology and even a Multilingual Medical Dictionary as well.

A must have link for any serious medical investigating on the web.