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Welcome to the interactive version of IUPAC Compendium of Chemical Terminology, informally known as the Gold Book. On these pages you will find a browsable, ...

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

The Organic Chemistry Portal offers an overview of recent topics, interesting reactions and information on important chemicals for organic chemists.

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

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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, glossary, foreign language translation, medical dictionary, and rhyming dictionary lists.