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

YourDictionary is a free online dictionary that offers definition search from Webster's dictionary for word meanings and thesaurus. Use this dictionary search as a crossword or scrabble dictionary. Also find legal dictionary, technical words, glossar...

Medical Dictionary is intended for use by healthcare consumers, students, and professionals as well as anyone who wants to keep up with the burgeoning array of terminology found in today’s medical news. By staying clear of jargon, the dictionary o...

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Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias. Ask questions, get answers.

The National Institute of Standards and Technology is a federal technology agency that develops and promotes measurement, standards, and technology.

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

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Mayo Clinic — Comprehensive medical diagnosis and treatment; locations and services; request an appointment.