Hosted online by chemsoc, compiled by the Royal Society of Chemistry, and originally published in print form by Blackwell Science in 1997, the International Union of Pure and Applied Chemistry (IUPAC) Compendium of Chemical Terminology has recently been made available online for free. The searchable compendium, popularly referred to as the "Gold Book," contains "nearly 7000 terms, with authoritative definitions, spanning the whole range of chemistry." The search screen provides users with easy access to definitions (.pdf).
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