? Of the colour of the flax-flower; azure.

Of a rich deep blue colour; made of mazarine (sense B. 1a). Now chiefly poetic.

Deep blue, azure.

Of a special deep-blue colour. (Cf. sense A. 3)

Of the colour of powder blue. Also in compounds, as powder-blue-grey adj.

Of the colour of smalt; deep blue.

Of the vivid deep blue colour of certain gentian flowers. Cf. gentian blue, adj.

In this sense used attributively or as adj.

Of a very deep blue colour; of the colour of the night sky.

Of the colour of lapis lazuli.

= smalt-blue, adj.