Source : Webster's Revised Unabridged Dictionary (1913)

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.