1. Adjective
Sky-blue; resembling the clear blue color of the unclouded sky; cerulean; also, cloudless.
2. Noun
The lapis lazuli.
3. Noun
The clear blue color of the sky; also, a pigment or dye of this color.
4. Noun
The blue vault above; the unclouded sky.
5. Noun
A blue color, represented in engraving by horizontal parallel lines.
6. Verb
To color blue.
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