achromatization
/əˌkrəʊmətʌɪˈzeɪʃn/ /eɪˌkrəʊmətʌɪˈzeɪʃn/Optics
noun
The action or process of achromatizing something, especially a lens in order to reduce or eliminate chromatic aberration.
Origin
Mid 19th century; earliest use found in Edinburgh Journal Science. From achromatize + -ation.