after-treatment
/ˈɑːftərˌtriːtm(ə)nt/ /ˈaftərˌtriːtm(ə)nt/noun
Later or further treatment; an instance of this.
Origin
Early 18th century; earliest use found in John Inett (?1647–1718), Church of England clergyman and ecclesiastical historian. From after- + treatment.