An Etymological Dictionary of Astronomy and Astrophysics

Water in the → solid state,
produced by freezing → liquid water; frozen water. Ice forms at or below a temperature of 0°C. Ice is less dense than liquid water because it expands during the process of freezing. This is because the molecular arrangement taken by ice leads to an increase in volume and a decrease in density. → maximum density of water

See also: → water; → ice.