aqua

Aqua is a term with several distinct uses. In Latin, aqua means water and it appears in scientific and cultural phrases such as aqua regia, a mixture that dissolves noble metals. In modern contexts, aqua is used as a color name describing a shade between blue and green. In the CSS color vocabulary, aqua is defined as the value #00FFFF.

Water, chemically H2O, is the essential compound for life on Earth, existing as solid, liquid, and gas. It is the most abundant substance on Earth's surface and a major component of living organisms; its properties include high polarity and heat capacity.

Aqua is also used in popular culture as the name of a Danish-Norwegian pop group formed in 1994, best known for Barbie Girl. In computing, Aqua refers to Apple's graphical user interface introduced with Mac OS X in 2001, noted for its use of translucency and rounded design elements. In fiction, Aqua is a character in the Kingdom Hearts video game series, depicted as a Keyblade Wielder and a member of its protagonists.