achromatize
transitive verb
achro·ma·tize
variants:
or British achromatise \ (ˈ)ā-ˈkrō-mə-ˌtīz 
\
\
achromatized
or British achromatised;
achromatizing
or British achromatising
Medical Definition of achromatize
: to make achromatic
achromatize a lens