A+ Materials Science and Engineering Glossary of Terms

Algorithms, Data Structures, and Problems - terms and definitions of algorithms, data structures, and classical problems in sorting, searching, combinatorics, graphs, and more.

Amateur Telescope Makers Dictionary - words in nine languages: English, French, German, Dutch, Portuguese, Spanish, Indonesian, Italian, and Russian. Definitions in English.

BioTech's Biotechnology Dictionary - free, searchable online dictionary of biology, chemistry, and biotechnology terms.

Chemistry & Environmental Dictionary - provides definitions for technical terms and acronyms, and related articles.

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.

GIS Dictionary - includes definitions for terms which either relate directly to GIS or which GIS users may come across in the course of their work.

Glossary of Botanical Terms - interactive glossary of terms relating to botany, gardening, horticulture and landscape architecture.

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 optimization.

Science Terms: Distinctions, Restrictions, and Confusions - discussion of familiar words that have specific or specialized 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.

Visual Dictionary of Special Plane Curves - including description, history, formulas, properties, and links for each.

Water Words Dictionary - from the Nevada Division of Water Planning.

Web Directory: Dictionaries and Unit Conversion for Engineers

Wind Energy Conversion Systems Glossary