aqua /ˈækwə/noun 2adjective 1forms 4 noun2 •A shade of colour, usually a mix of blue and green similar to the colour turquoise.Ms. Rockburne, with help from a team of artists, is working on a gargantuan mural of deep blues, shimmering aquas and luminous gold leaf that is headed for the American Embassy in Kingston, Jamaica. — 2009 •The compound water. adjective1 •Of a greenish-blue colour. formsaquae · aquas · more aqua · most aqua