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Online Dictionaries

  • Hawley's condensed chemical dictionary
    • Also useful for very basic properties, molecular formulas
  • Beilstein Dictionary (German-->English)
    • For users of the Beilstein Handbook of Organic Chemistry
  • IUPAC Compendium of Chemical Terminology (the "Gold Book")
    • Interactive version: An updated (2006) and more interactive version than the one below.
    • Online version: This version of the IUPAC Compendium of Chemical Terminology mostly corresponds to the second edition (1997), compiled by Alan D. McNaught and Andrew Wilkinson (Royal Society of Chemistry, Cambridge, UK). Towards the end of 2003, work began on the addition of terms from more recent IUPAC recommendations, with the intention of eventually bringing the website into a condition in which it can be maintained up-to-date. A cross (+) against an entry implies that use of the term is discouraged.
  • IUPAC Quantities, Units and Symbols in Physical Chemistry (the "Green Book")
  • Encyclopedic Dictionary of Polymers
  • Credo Reference
    • Online dictionaries, encyclopedias, thesauri. Chemistry coverage is limited to general dictionaries.

Language Dictionaries