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

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Online Medical Dictionary and glossary with medical definitions

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

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictiona...

Biology Online, information in the life sciences in the form of tutorials, references and an online dictionary of biology terms.

The starting place for exploring Biology. Find information about human anatomy, cell anatomy, online dissections and much more.

WormAtlas: A database of behavioral and structural anatomy of Caenorhabditis elegans.