From Longman Business Dictionary
slanderslan·der1 /ˈslɑːndəˈslændər/ noun [countableC, uncountableU]LAW a spoken statement about someone that is not true and is intended to damage the good opinion that people have of him or her, or the legal offence of making a statement of this kindThe company is being sued for slander by four pharmacists who say the retailer publicly ruined their reputations.