achromatism

Definition of Achromatism in English :

the visual property of being without chromatic color

WordNet Lexical Database for English. Princeton University. 2010.

Achromatism

noun

the condition or quality of being achromatic; lack of color

: also aˌchromaˈticity (eɪˈkroʊməˈtɪsəti ; ākrōˈmətisˈətē)

adj.

1. Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.

2. Refracting light without spectral color separation.

3. Biology Difficult to stain with standard dyes. Used in reference to cells or tissues.

4. Music Having only the diatonic tones of the scale.