SumatraPDF built in dictionary

Hi all, this application is great. Can we add a feature for a built in dictionary?

Generally it would be pointless to add the standard spell checking dictionaries they are more often needed by authors in an editor.

Most useful for readers is a web search link to a bank of dictionary / thesauruses’ such as OED and several similar requests have been made but it need someone to add the code, however it is already possible to use 3rd party windows tools to do web look-ups in any app.