• AGI GIS Dictionary - Free Edition - This on-line dictionary of GIS terms is brought to you by the Association for Geographic Information and the University Of Edinburgh Department of Geography.
• arXiv.org - All papers Titles Authors Abstracts Full text Help pages Open access to 364,938 e-prints...
• Belstein Dictionary - For users of the Beilstein Handbook of Organic.
• BioTech's Science Dictionary - Terms associated with genetics, biochemistry, biotechnology, botany, chemistry, ecology, limnology, pharmacology, toxicology and medicine. Chemistry. In German and English.
• Dictionary of Botanical Epithets - The epithets are largely taken from alpine plants and found in the seed lists of the North American Rock Garden Society's seed list, alpine plant nursery catalogs and alpine references.
• Dictionary of Measures, Units and Conversions - This provides a summary of most of the units of measurement to be found in use around the world today, together with the appropriate conversion factors needed to change them into a 'standard' unit of the S I.
• Digital Library for Earth System Education - A free service funded by the National Science Foundation.

• Encyclopedia Smithsonian - Features answers to frequently asked questions about the Smithsonian and links to Smithsonian resources on subjects from Art to Zoology.
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• Geology and Earth Science Definitions - Consult our geology dictionary for definitions, images and short articles about the most commonly used geological terms.
• How Many? - A Dictionary of Units of Measurement.
• High-Tech Dictionary - Search for thousands of technology terms.
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• The Nine Planets Glossary
• MARTINDALE'S - THE REFERENCE DESK
• Martindales's Calculators On-Line Center - Physcis, Astorphysics & Astronomy.
• Science Reference Services (Library of Congress)
• WWWVL - History of Science, Technology and Medicine - Biographical Sources

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