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1.
Goneril is the eldest daughter in Shakespeare's King Lear.

Goneril treats her father well, until he becomes old, and gives her and her husband a plot of land and a lot of money. Then she starts treating him really crappily.

A girl, or guy, who is described as a Goneril, is someone who abuses and takes advantage of those who love him/her the most.
"My brother's daughter turned out to be such a Goneril. We haven't spoken with her since he died."
by queen.padme.amidala May 23, 2005

Words related to Goneril

gonerils
 
2.
Noun a.-
Nuts, gonads, balls, testicles.
You deserve a swift kick to the gonerils
by Agnelicentella Ebonlore January 29, 2004