The largest and most term packed dictionary around is the Oxford English Language dictionary. The dictionary has been published since the 1800's and is now on its second edition. The company behind the dictionary also runs an online version that costs about $300 for a year of access.
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The online version is booming in popularity with a much higher demand than the print version. The third edition of the venerable dictionary is being worked on and isn't expected to be complete for another decade. By the time it is done there is speculation that a print version may not even be offered.
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The full print version of the dictionary has 20 volumes, weighs 750 pounds, and was last updated in 2009. The online version is updated every three months and has 2 million monthly visitors compared to the 30,000 copies sold of the print version since 1989.