Software for showing the meaning of the words on double click in ubuntu pdf viewer

I want to know if there is any possible way to fastly know the meaning of unknown words while reading through ubuntu's default pdf viewer. I will have to copy and google the word to know the meaning.

What if the pdf viewer prompts the meaning of the word on double click? That would be great! Is there any possible way to get that feature? Any software to install? I don't want other pdf viewers which meet the requirement but don't have other features which ubuntu one has.

You can try Okular instead of the default PDF viewer (Evince). It has an option to google search for a word or a phrase. You can also configure the options,and enable search in Wikionary and the Merriam-Webstar dictionary.

You can install it with

sudo apt install okular

Not exactly what you wanted, but this is the next best thing.