A person who discredits or undermines confidence in a person or thing. Also occasionally: a person who does not give credence to something, a disbeliever.
Origin
Mid 16th century; earliest use found in John Foxe (?1517–1587), martyrologist. From discredit + -or, after creditor.
Definition of discreditor in US English:
discreditor
noundɪˈskrɛdɪtə
A person who discredits or undermines confidence in a person or thing. Also occasionally: a person who does not give credence to something, a disbeliever.
Origin
Mid 16th century; earliest use found in John Foxe (?1517–1587), martyrologist. From discredit + -or, after creditor.