This question already has an answer here:
No matter which browser you use, there's always a Look Up menu when right-clicking any text inside the web browser.
I have disabled Lookup/Spotlight suggestions on right-clicking, via System Preferences, but on right-clicking any text in any browser, the Look Up menu still shows up with dictionary suggestions.
Is there anyway to disable this from the core. I have gone through other AskDifferent posts similar to mine, but none of them seems to have an answer!