achromatism

from WordNet (r) 3.0 (2006)

achromatism
    n 1: the visual property of being without chromatic color [syn:
         {colorlessness}, {colourlessness}, {achromatism},
         {achromaticity}] [ant: {color}, {coloring}, {colour},
         {colouring}]

from The Collaborative International Dictionary of English v.0.48

Achromatism \A*chro"ma*tism\, n. [Cf. F. achromatisme.]
   The state or quality of being achromatic; as, the achromatism
   of a lens; achromaticity. --Nichol.
   [1913 Webster]

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