Search across thousands of comprehensive encyclopedia entries covering all major science disciplines. This database also includes definitions of scientific terms, biographies of well-known scientists, a few textbooks, and Schaum's Outlines. (McGraw-Hill)
The Glossary of Meteorology is an online resource published by the American Meteorological Association. It is a living document with more than 12,000 definitions that are meant to be updated or added to regularly as terms in the field evolve.