An open source PDF reader with built in dictionary or plugins?

Question

I'm using Adobe Acrobat for my daily PDF reading and there are a lot of words I need to translate. Now I have to double click > copy > open browser > past > search for meaning > go back to PDF reader. This is cumbersome. I was wondering if there are any PDF readers, most preferably open source and cross platform, which has a built in dictionary (or plugin) activated by double clicking on a word?

P.S.1. I suppose some of the open source softwares suggestion here should have this feature.

P.S.2. I have also asked this question here in reddit.

Answer 1

I found a tutorial of adding a real-time google translation button for pdf-xchange editor. Although pdf-xchange editor is not open source software, but I think it is a good hint for other pdf viewers.

update

You can download PDF-XChange Editor free version here

Answer 2

A solution other than a specific PDF reader is to use an external program such as GoldenDict. It features a so-called ”Scan Popup“: Each time you select a word in any program—e.g. in your favourite PDF reader—a popup containing the lookup result will show up.

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(*) trom the GoldenDict in-application help: [source code]

To look up words from other active applications, you would need to first activate the "Scan popup functionality" in Preferences, and then enable it at any time either by triggering the '[Scan] Popup' icon [in the toolbar], or by clicking the tray icon [..] with your right mouse button and choosing so in the menu you've popped.