Boo Blue

Blue

Blue is one of the three primary colours in the RGB (additive) colour model, as well as in the RYB colour model. It lies between violet and cyan on the spectrum of visible light. The term blue generally describes colours perceived by humans observing light with a dominant wavelength between approximately 450 and 495 nanometres. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called the Tyndall effect explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective.

boo

Symbol

1. ISO 639-3 language code for Tiemacèwè Bozo.

Interjection

1. A loud exclamation intended to scare someone. Usually used when one has been hidden from the target, and then appears unexpectedly. Often used in playful or jokeful context.
2. An exclamation used by a member of an audience, as at a stage play or sporting event, to indicate derision or disapproval.

blue

Adjective

1. Of a blue hue.
2. Depressed, melancholic, sad.

Noun

1. The colour of the clear sky or the deep sea; the colour midway between green and violet in the visible spectrum and one of the primary additive colours.
2. Anything coloured blue, especially to distinguish it from similar objects differing only in colour.