Online Encyclopaedias and Dictionaries for Engineering

Knovel Library
A collection of online engineering reference books covering aerospace, chemical, civil, electrical, mechanical and general engineering and including information about adhesives, biochemistry, biotechnology, ceramics, electronics, environment, food science, metals, oil & gas, plastics, pharmaceuticals, power, safety, textiles and more.
CHEMnetBASE
A collection of major reference works for chemical information, comprising: The handbook of Chemistry and Physics (84th Edition), Polymers: A Property Database, The Combined Chemical Dictionary, The Dictionary of Commonly Cited Compounds, Dictionary of Inorganic & Organometallic Compounds, Dictionary of Natural Products, Dictionary of Organic Compounds, Dictionary of Drugs.
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Wiley Interscience Reference Works
Access to Kirk-Othmer encyclopedia of chemical technology, Ullmann's Encyclopedia of Industrial Chemistry, Wiley Encyclopedia of Electrical and Electronics Engineering, Handbook of plant biotechnology, Handbook of statistical genetics
Major Reference Works @ ScienceDirect
Access to Comprehensive Clinical Psychology, Comprehensive Coordination Chemistry II, Encyclopedias of Applied Plant Sciences, Applied Psychology, Biological Chemistry, Social & Behavioral Sciences, Biological Chemistry, Human Nutrition, Language & Linguistics, Materials: Science and Technology, Ocean Sciences, Social Measurement, Soils in the Environment, and Spectroscopy and Spectrometry, and the International Encyclopedia of the Social & Behavioral Sciences
Other Titles
Computational Methods in Biophysics
Computer Science & Communications Dictionary
Concise Encyclopedia of Supersymmetry and Noncommutative Structures in Mathematics and Physics
Encyclopedia of Operations Research and Management Science
Encyclopedia of Optimization
Encyclopedia of Production and Manufacturing Management
Handbook of Nanophase and Nanostructured Materials
Handbook of Nuclear Chemistry
Magnetism
Polymer Blends Handbook
Riegel's Handbook of Industrial Chemistry
The World's Coasts Online - temporarily unavailable
Encyclopadia of Modern Optics
Free Internet Resources
Engineer Manuals (USACE) U.S. Army Corps of Engineers Manuals in full text.
Science & Engineering Encyclopedia Science and engineering descriptions, equations, conversions, calculators and material data. Organized by A to Z, subject and interlinked. A useful resource for professional engineers, teachers and students.
Constants and Conversion Factors links to a number of sites with information about weights, measures and units conversion/calculation.
Engineering Statistics Handbook is an easy to use handbook to help scientists & engineers incorporate statistical methods in their work as efficiently as possible; provided by the US Government NIST.
Encyclopedia of laser physics and technology explains basic terms and principles of laser physics and technology, with some content added from other topics such as general optics, nonlinear optics and quantum optics.
Linktionary: Networking defined and hyperlinked A free online dictionary covering communications and networking technologies, including basic data, major topics and updates.
The Photonics Dictionary by Laurin Publishing explains industry-related terms, acronyms and abbreviations.

See also Quick Reference links to Internet Reference material of general interest