A blue colour on a coat of arms, represented in engraving by horizontal parallel lines.

The clear blue colour of the sky; also, a pigment or dye of this colour.

The unclouded sky; the blue vault above.

Any of various widely distributed lycaenid butterflies of the genus Celastrina.

Any of various Australasian lycaenid butterflies of the genus Ogyris.

Lapis lazuli.

To colour blue.

Sky blue; resembling the clear blue colour of the unclouded sky

Cloudless

In blazon, of the colour blue.