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.

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

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

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.

a. The sky.
b. The sea.

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