- Amateur Telescope Makers Dictionary
 - Words in nine languages: English, French, German, Dutch, Portuguese, Spanish, Indonesian, Italian, and Russian. Definitions in English. - Chemistry & Environmental Dictionary
- Provides definitions for technical terms and acronyms, and related articles.
- Dictionary of Algorithms and Data Structures
- Dictionary of algorithms, algorithmic techniques, data structures, archetypical problems, and related definitions.
- Dictionary of Cell and Molecular Biology
- Provides quick access to easily-understood and cross-referenced definitions.
- Dictionary of Units, A
- An explanation of the principle systems of units, their history, standards, and conversion factors for changing from one to the other.
- Glossary of Botanical Terms
- Interactive glossary of terms relating to botany, gardening, horticulture, and landscape architecture.
- Glossary of Genetic Terms
- Created by the National Human Genome Research Institute (NHGRI) to help people without scientific backgrounds understand the terms and concepts used in genetic research.
- Glossary of Satellite Terms
- Glossary of Space Terms
- From the NASA Jet Propulsion Laboratory.
- How Many?
- Dictionary of units of measurement with commentaries and explanations of the English Customary, Metric, and International Systems.
- Hypertext Glossary of Genetic Terms
- Searchable database of genetic terms with hypertext cross references and pictures.
- Lexicon EncycloBio
- Provides biological terms, definitions with pictures, and Flash movies. Includes an internal search engine.
- Mathematical Programming Glossary
- Glossary of terms (plus supplements) used in optimisation.
- Maths Dictionary for Kids, A
- Easy definitions for basic math.
- Plasma Dictionary
- Database of plasma physics terms.
- Science Terms: Distinctions, Restrictions, and Confusions
- Discussion of familiar words that have specific or specialised meanings in science, and scientific terms that are easy to confuse. From The American Heritage Book of English Usage.
- University of Alberta Cognitive Science Dictionary
- Visionary
- A dictionary for the study of human and animal vision, including terms from biological and machine vision, visual psychophysics, visual neuroscience, and other related fields.
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