medscape Reference from Reference.medscape.com
Medical dictionary from Online-medical-dictionary.org
Medical dictionary from Medical-dictionary.com
Medline Plus from National Library of Medicine
Dictionary from Familydoctor.org
Reference.md from Reference.md
Dictionary of Cancer Terms from National Cancer Institute
Dictionary of Genetics Terms from National Cancer Institute
Drug Dictionary from National Cancer Institute
Drug from Aids Info
diseasesdatabase from Diseasesdatabase.com
NCI Thesaurus from Ncit.nci.nih.gov
NCI Term browser from Ncit.nci.nih.gov
Dictionary from Dictionary.com
Oxford dictionaries from Oxforddictionaries.com
merriam webster from Merriam-webster
The free dictionary from Thefreedictionary.com
Collins dictionary from Collinsdictionary.com