A certain wavelength of light lying within the visible spectrum, while being the shortest wavelength. On average, it is about 475 nanometers. Its very near the ultraviolet spectrum, which is bluer than a normal human can see. It is the color of the sky, ocean, and some peoples' eyes. Honestly, I'm hoping only the colorblind are seeing this, cuz otherwise this is kinda dumb.
"Wow! The sky is so blue!"
via giphy
by FightOnG November 18, 2016

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The color of the above word entry.
The word entry is blue.
by That_0ne_Person January 30, 2016

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Blues describes both a musical genre as well as the emotional state that produces it. Usually related to heartbreak, death, loss, being broke & generally treated like shit is the the blues.
Man I got the blues today and can't seem to shake them. Albert King said "if you don't dig the Blues then you got a hole in your soul".
by saharadryhumor March 14, 2015

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A Canadian 5-Dollar Bill.
Can you give me change instead of a Blue?

You owe me 3 Blues.
by Floru January 08, 2011

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a colour
the sky is blue
by Dan Stringy September 10, 2008

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A depressant drug.
"I got some nice blues. Wanna get fucked up?"
by junkyman420 March 13, 2004

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A color, emotion, and a NAME. The color comes in many hues, is one of the three primary, and is the color of the sky and ocean. Used as an emotion, it usually means sad. Blue can be used as either a boy or girl's name. People who have the name Blue are one of a kind and should not be compared to Beyoncé's daughter. Blue's are usually fun, well rounded, and have a unique attractiveness to them.
Color: "On a clear day the sky is blue." Emotion: "My dog died. I am having a blue day." Name: "Oh, Blue? Yeah, he/she is pretty cool."
by ifonlyiwasreading November 10, 2014

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