plural of holly blue

A rare, medium-sized blue butterfly (Phengaris arion) of the family Lycaenidae.

plural of blue card

The dye nigrosine.

plural of small blue

(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