Hyperlinking to a Dictionary Word
From Mac Guides
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The Dictionary application has a launch service that lets links within a Web page point to an entry in the Dictionary. It is intended for use by Dictionary itself, which is built on the same WebKit framework used by Safari. As a side effect, it can be used within general purpose browsers.
The format is
For example, copy and paste this link into a Web browser's address bar:
This protocol only works if Dictionary is already running. Otherwise, the link will simply open Dictionary and take no further action.