(transitive, business) To engage in blue-sky thinking about.

A moderate greenish blue. / academy blue:

(inorganic chemistry) A complex oxide derived from a heteropoly acid of molybdenum and another element, typically phosphorus

A pigment prepared from calcined lapis lazuli; ultramarine. / A blue pigment prepared from carbonate of copper.

A purplish-blue color resembling that of blueberries

Of a purplish-blue colour resembling that of blueberries.

Trigonella caerulea, a variety of fenugreek with blue flowers.

(business) Of or related to an industry lacking competition.

A river originating at Lake Tana in Ethiopia and flows into the Nile at Khartoum in Sudan; one of the two major tributaries of the Nile. / A state in southern Sudan.

plural of blue wall