An AHK script that searches the selected text using Google Dictionary Chrome extension when the hotkey is pressed, even works on a PDF page.
Install Google Dictionary and AutoHotkey first.
Hotkey: ctrl + shift + z (edit the script to customize)
Note: You have to make the dictionary extension icon visible to use the script. The script uses the ImageSearchMake function to find the icon. Make a screenshot of the icon starting from its center to the bottom right corner, rename it 'google_dict.png' and place it in the same folder as the script.