blue

Blue
1. The hue of that portion of the visible spectrum lying between green and indigo, evoked in the human observer byradiant energy with wavelengths of approximately 420 to 490 nanometers; any of a group of colors that may vary inlightness and saturation, whose hue is that of a clear daytime sky; one of the additive or light primaries; one of thepsychological primary hues.
2.

a. A pigment or dye imparting this hue.
b. Bluing.
3.

a. An object having this hue.
b. Dress or clothing of this hue: The ushers wore blue.
4.

a. A person who wears a blue uniform.
b. blues A dress blue uniform, especially that of the US Army.
5. often Blue

a. A member of the Union Army in the Civil War.
b. The Union Army.
6. A bluefish.
7. Any of various small blue butterflies of the family Lycaenidae.
8.

a. The sky.
b. The sea.

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