Blue is the colour of the clear sky and the deep sea. On the optical spectrum, blue is located between violet and green.

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  1. The colour of the clear sky or the deep sea, between green and violet in the visible spectrum, and one of the primary additive colours for transmitted light; the colour obtained by subtracting red and green from white light using magenta and cyan filters; or any colour resembling this.
  2. A blue dye or pigment.
  3. Any of several processes to protect metal against rust.
  4. Blue clothing
    The boys in blue marched to the pipers.
  5. A blue uniform. See blues.
  6. A member of law enforcement
  7. The sky, literally or figuratively.
    The ball came out of the blue and cracked his windshield.
    ''His request for leave came out of the blue.
  8. The ocean; deep waters.
  9. Anything blue, especially to distinguish it from similar objects differing only in color.
  10. One of the colour balls used in snooker, with a value of 5 points.
  11. Any of the blue-winged butterflies of the subfamily '''' in the family Lycaenidae.
  12. A bluefish.
  13. An argument.
  14. A liquid with an intense blue colour, added to a laundry wash to prevent yellowing of white clothes.
  15. A type of firecracker.
  16. A pedantic woman; a bluestocking.


  1. To make or become blue.
  2. To treat the surface of steel so that it is passivated chemically and becomes more resistant to rust.
  3. To spend (money) extravagantly; to blow.


  1. Of the colour blue.
    the deep blue sea
  2. Depressed, melancholic, sad.
  3. Pale, without redness or glare; said of a flame.
    The candle burns blue.
  4. Pornographic or profane.
    The air was blue with oaths.
    a blue movie
  5. Supportive of, run by (a member of), pertaining to, or dominated by a political party represented by the colour blue. (e.g. The Conservatives, the Democrats)
    I live in a blue constituency.
    Congress turned blue in the mid-term elections.
  6. of or related to the Liberal Party.
    Illawarra turns blue in Liberal washout. ABC News 29 March 11.
  7. Of the higher-frequency region of the part of the electromagnetic spectrum which is relevant in the specific observation.
  8. Extra rare; left very raw and cold.
  9. Possessing a coat of fur that is a shade of gray
  10. Severe or overly strict in morals; gloomy.
    blue and sour religionists
    blue laws
  11. literary; bluestockinged; applied to women

The above text is a snippet from Wiktionary: blue
and as such is available under the Creative Commons Attribution/Share-Alike License.

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