This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state or quality of being blue.

n. The quality of being blue; a blue color.

n. The quality of being blue in any sense.

n. blue color or pigment; resembling the color of the clear sky in the daytime

"To perceive a blue carpet is to have a representational state the content of which is the carpet and the property blueness, that is,."

spectral color    chromatic color    spectral colour    chromatic colour   

Prussian blue    cerulean    greenish blue    peacock-blue    aquamarine    navy blue    dark-blue    ultramarine    purplish blue    turquoise   

Eunice    newness   

redness    ruddiness    whiteness    greenness    roundness    wire-pulling    yellowness    pallor    crookedness    rosiness