plural of blue card

The dye nigrosine.

(UK) A very small butterfly, Cupido minimus, of the lycaenid subfamily Polyommatinae, the blues / (US) A very small butterfly, Philotiella speciosa, of the lycaenid subfamily Polyommatinae, the blues

(colour, glassworking) A shade of blue created for the stained glass windows of Chartres Cathedral, containing traces of red for enhancement.

A grayish shade of the color blue, like the metal steel

Having or resembling this shade of blue

plural of blue heeler

(informal) The Pour le Mérite military honour.

An award given to European beaches, based on cleanliness and water quality.

present participle of work blue