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

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...

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CDC Centers for Disease Control and Prevention - Your Online Source for Credible Health Information

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

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

The National Birth Defects Prevention Study is the largest study in the U.S. looking at the causes of birth defects. The study began in 1996 when Congress directed the Centers for Disease Control and Prevention (CDC) to establish the Centers for Birt...