Han Yu Da Ci Dian, literally Comprehensive Chinese Word Dictionary, is the most inclusive available Chinese dictionary. It has diachronic coverage of the Chinese language, and traces usage over three millennia from Chinese classic texts to modern slang. Includes over 23,000 head entries, defines some 370,000 words, and gives 1,500,000 citations.
http://digital.library.wisc.edu/1711.web/hanyudacidian
This permalink is a direct, persistent URL to the database that will always work and won't break.