Instructions courtesy of @chancelionheart:
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Access the Settings menu by clicking the Options icon in the upper-right corner of the browser window. It is the icon with three horizontal lines stacked on top of each other. Click on “Settings” near the bottom of the Options menu.
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Under the “Search” heading in the Settings menu, click the "Manage search engines" button.
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At the bottom of the Search Engines window that comes up, enter the following: Name: Use whatever you like (I used "Webster's Revised 1913+1928 Dictionary") Keyword: Also whatever you like, I just use 'd' for easy access. Url: http://machaut.uchicago.edu/?resource=Webster%27s&word=%s&use1913=on&use1828=on (replaces the search term with %s, what google chrome uses for the query)
Now, you can search the dictionary from any new tab by typing in your keyword, a space, then the word.