Astronomical term for a type of planet like Uranus or Neptune, composed mainly of elements heavier than hydrogen and helium, such as water, ammonia, and methane ices. Also referred to as 天王星型惑星.
See also: 天王星型惑星 (てんのうせいがたわくせい)
天王星と海王星はアイスジャイアントに分類される。
Uranus and Neptune are classified as ice giants.