Science Struck
Science Struck: Glossary of Chemistry Terms and Definitions
Gives the dictionary definitions for a lengthy list of chemistry terms.
Other
Seymour Simon: Science Dictionary
A Webby Award Honoree in 2011, this dictionary is useful for those searching for scientific terms and definitions.
National Institutes of Health
Niehs: What's That Word?
Not sure of what a word means in science? Find out in this easy to read online scientific dictionary.
Science Struck
Science Struck: Glossary of Science Terms and Scientific Definitions
Gives the dictionary definitions for a lengthy list of science terms.