The definition of cathartic is something cleansing.(adjective)
An example of cathartic is getting rid of clothes that no longer fit.
See cathartic in Webster's New World College Dictionary
Origin: Gr kathartikos
Origin: LL catharticum
See cathartic in American Heritage Dictionary 4
Origin: Late Latin catharticus
Origin: , from Greek kathartikos
Origin: , from kathairein, to purge; see catharsis.
Learn more about cathartic