blue

(blo͞o)

1. The hue of that portion of the visible spectrum lying between green and indigo, evoked in the human observer by radiant energy with wavelengths of approximately 420 to 490 nanometers; any of a group of colors that may vary in lightness and saturation, whose hue is that of a clear daytime sky; one of the additive or light primaries; one of the psychological 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 U.S. Army.
5. often Blue
   a. A member of the Union Army in the Civil War.
   b. The Union Army.
6. A bluefish.
7. A small blue butterfly of the family Lycaenidae.
8. a. The sky.
   b. The sea.

1. Of the color blue.
2. Bluish or having parts that are blue or bluish, as the blue spruce and the blue whale.
3. Having a gray or purplish color, as from cold or contusion.
4. Wearing blue.
5. a. Gloomy; depressed. See Synonyms at depressed.
   b. Dismal; dreary: a blue day.
6. Puritanical; strict.
7. Aristocratic; patrician.
8. Indecent; risqué: a blue joke; a blue movie.

Related Forms:

• blueˈly adverb

• blueˈness noun