Chemistry Dictionary & Glossary

Thank you for visiting! Our website is a free online chemistry dictionary and glossary containing 1800+ terms and definitions.

Everyone is invited to use our site to help further their knowledge, students and teachers alike. To start browsing the dictionary, choose a letter to list all the terms starting with that letter. You can also search our dictionary using the search box provided.

Our collection of chemistry terms and definitions cover all areas, including: general chemistry science, organic chemistry, inorganic, biological, physical, environmental and analytical chemistry. Students of all study levels use our site to find solutions and help for their problems, questions and projects.

We also maintain a list of helpful periodic tables. There you will find the best interactive periodic tables on the net, along with many different printable versions.

Our dictionary terms and definitions have been taken from various public domain, GNU and government sources. We have done our best to verify the accuracy and quote the correct sources. Please contact us if you feel any of our terms or definitions need to be updated or corrected in any way. We appreicate the feedback!