Black's Law Dictionary of course is more prestigious and widely accepted. 

http://thelawdictionary.org/libel/
http://thelawdictionary.org/slander/

And I did neither.  

Barking your point again and again lowers your credibility more and more.  Have at it. 

There is no question that you regularly (as recently as last week) "borrow and embed" the published and copyrighted work of others, presenting them as your own comments without attribution.