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