- Aids 101 Glossary
- Aids Glossary of Medical, Statistical, and Clinical Research Terminology
- Allergy Glossary: The Respiratory System
- Cambridge Dictionary of Epidemiology
- Diabetes Dictionary
- Dictionary of Cell Biology
- Dictionary of English Medical Terms
- Dictionary of Online Medical Resources
- DrugBase Medication and Pharmaceutical Guide - guide to package inserts, medical information, medication and pharmaceutical products
- English Dictionary of Epidemiology
- Glossary of Medicinal Herbs
- Glossary of Medical Terms - in several European languages
- Glossary of Nomenclatural Terms in Zoology
- Glossary of Nuclear Terms
- Infomed Drug Guide - English adaptation of a German guide to 100 drugs
- Kaiser Permanente's Medical Glossary
- Life Science Dictionary - Biotech's free online dictionary of biochemistry and genetics, general biology, chemistry, pharmacology and toxicology
- MedicineNet Medical Dictionary
- The On-line Hypertext Medical Dictionary (Gray Laboratory)
- Medical/Surgical Word Glossary - FDA approved drugs, devices, surgical/medical instruments, and procedures
- MedicineNet Glossary
- Medspeak - the ER dictionary
- Online Medical Dictionary - OMD is a searchable dictionary of terms relating to biochemistry, biology, chemistry, medicine, molecular biology, physics, plant biology, radiobiology, zoology, science and technology
- RxList - drug name cross index, available free
- Virtual Drug Store - one-stop reference guide to pharmaceuticals, the newest research and the latest reports with details on side effects and drug interactions
- Visionary - A Dictionary of terminology in vision research. The dictionary includes terms from "biological and machine vision, visual psychophysics, visual neuroscience, and other related fields. (Boston University)
- Merriam-Webster Online : Search : Dictionary : Thesaurus
- Euro-Dictionary - From the European Commission Host Organization (ECHO)
- Finnish-English Dictionary
- French-English Dictionary - Look up words in a simple French English Dictionary containing about 75,000 terms
- Online Dictionary of Computing
- Hacker's Dictionary
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