The Collaborative International Dictionary of English v.0.48:
Achromatize \A*chro"ma*tize\, v. t. [imp. & p. p. Achromatized; p. pr. & vb. n. Achromatizing.] [Gr. 'a priv. + ? color.] To deprive of color; to make achromatic. [Also spelled achromatise.] [1913 Webster]WordNet (r) 3.0 (2006):
achromatize v 1: remove color from; "achromatize the lenses" [syn: achromatize, achromatise]