- http://www.harcourt.com/dictionary/ - Harcourt and Academic Press bring us the Dictionary of Science and Technology, the largest scientific dictionary ever compiled in the English language to the web. Search from over 130,000 terms defined in 130 fields of science.
- http://www.xrefer.com/books/oupdsci/about.jsp - xrefer is working with some of the world's best known publishers to bring together and interlink their reference works online. xrefer contains encyclopedias, dictionaries, thesauri, books of quotations, and reference works covering a wide range of subjects. And the best thing is that all this content is intelligently linked to allow you to follow a trail of relevant information throughout our extensive library. This link takes you to their science dictionary section.
- http://www.eurekalert.org/resources/definitions.html - The Reference Desk index consists of links to glossaries or dictionaries from several scientific disciplines. They are provided and maintained by government, academic, research-oriented, and professional organizations.
- http://www.sciencekomm.at/advice/ - Scroll down the page or follow the links to a range of online science and medical dictionaries and glossaries.
- http://www.bartleby.com/64/4.html - In this section, Bartleby.com brings us a discussion (from the editors of the American Heritage Dictionary) of familiar words that have specific or specialized meanings in science and scientific terms that are easy to confuse.