Definitions
1.nounThe 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.nounA blue dye or pigment.
3.nounAny of several processes to protect metal against rust.
4.nounBlue clothing"The boys in blue marched to the pipers."
5.noun(in the plural) A blue uniform. See blues.
6.nounA member of law enforcement
7.nounThe sky, literally or figuratively."His request for leave came out of the blue."
8.nounThe ocean; deep waters.
9.nounThe far distance; a remote or distant place.
10.nounAnything blue, especially to distinguish it from similar objects differing only in color.
11.nounA dog or cat with a slaty gray coat.
12.nounOne of the colour balls used in snooker, with a value of five points.
13.nounAny of the butterflies of the subfamily Polyommatinae in the family Lycaenidae, most of which have blue on their wings.
14.nounA bluefish.
15.nounAn argument.
16.nounA liquid with an intense blue colour, added to a laundry wash to prevent yellowing of white clothes.
17.nounA type of firecracker.
18.nounA bluestocking.
19.nounOne of the three color charges for quarks.