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ChemSpider is a free chemical structure database providing fast access to over 26 million structures, properties and associated information.

NIST site provides chemical and physical property data on over 40,000 compounds.

PubChem homepage

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

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Thousands of biochemicals and research products. A dedicated team of scientists and support staff. Helping to make your research possible

Perfumery, Flavor & Botanical Information Center.

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...

Environmental Working Group (EWG) works to protect kids from toxic chemicals in our food, water, air and the products we use every day. We use research to help create federal policies that protect our children, our health, and our natural resources.

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...