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Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.

Dictionary.com - the largest and most trusted free online dictionary. Instantly look up accurate and extensive definitions and word meanings, and hear audio pronunciations.

Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

Online Medical Dictionary and glossary with medical definitions

Princeton University is a vibrant community of scholarship and learning that stands in the nation's service and in the service of all nations.

The eMedicine point-of-care clinical reference features up-to-date, searchable, peer-reviewed medical articles organized in specialty-focused textbooks, and is continuously updated with practice-changing evidence culled daily from the medical literat...

Discovery Health explores the human body in all its scientific and cultural aspects. Learn about diseases, wellness, medical technology and more on Di

The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world

Free online English dictionary from Oxford, plus thesaurus, word of the day, resume examples, letter writing, and English grammar

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia e...

The leading source for trustworthy and timely health and medical news and information. Providing credible health information, supportive community, and educational services by blending award-winning expertise in content, community services, expert co...