Take a look at the new OED Online
The new redesigned,
re-engineered Oxford English Dictionary
Online contains not only new content, but a new look, new
features and functionality, and a wealth of changes and updates
that will open up the language, and its history, as never
before.
To find out more about the re-launched OED:
http://www.oed.com/public/welcome/welcome-to-the-new-oed-online