Gray's Anatomy of the Human Body - http://www.bartleby.com/107/
Twentieth Edition, thoroughly revised and re-edited, includes 1,247 vibrant engravings, many in color, from the classic 1918 publication, as well as a subject index with 13,000 entries.
MediLexicon: Medical Abbreviations Dictionary - http://www.pharma-lexicon.com/
Look up meanings of acronyms or search for an acronym by its definition. Covers the fields of medicine, pharmacy, biotechnology, agrochemicals, healthcare and more. A free resource provided by MediLexicon which is based in Hastings, East Sussex in the UK.
Multilingual Glossary of Medical Terms - http://allserv.rug.ac.be/%7ervdstich/eugloss/welcome.html
Technical and popular medical terms in English, Dutch, French, German, Italian, Spanish, Portuguese and Danish. This project was commissioned by The EuropeanCommission(DG III) and executed by Heymans Institute of Pharmacology and Mercator School, Department of applied Linguistics.
The Merck Manual of Medical Information -- Home Ed - http://www.merck.com/pubs/mmanual_home/
The Merck Manual of Medical Information -- Home Edition