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.
A blue dye or pigment.
Any of several processes to protect metal against rust.
Blue clothing Example: The boys in blue marched to the pipers.
(in the plural) A blue uniform. See blues.
A member of law enforcement
The sky, literally or figuratively. Example: His request for leave came out of the blue.
The ocean; deep waters.
The far distance; a remote or distant place.
Anything blue, especially to distinguish it from similar objects differing only in color.
A dog or cat with a slaty gray coat.
One of the colour balls used in snooker, with a value of five points.
Any of the butterflies of the subfamily Polyommatinae in the family Lycaenidae, most of which have blue on their wings.
A bluefish.
An argument.
A liquid with an intense blue colour, added to a laundry wash to prevent yellowing of white clothes.
A type of firecracker.
A bluestocking.
One of the three color charges for quarks.
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