Definition/synonym search on online dictionary

Hi,
As it’s possible to launch a word definition search with Google (Writing Tools > Look Up in Google Definitions), I was wondering if it was possible to have the same function but directly to an online dictionary. I am using a really complete one and I’d like to go to it when I need to make this king of search.

I also think it will be great to have a shortcut to a synonyms dictionary or better, as I said before to have the option to parameter the page of the online synonyms dictionary we use.

Thanks

(I am using Scrivener to finish my second novel, which will probably be released at the beginning of the next year (France))