天てん王のう星せい型がた惑わく星せいてんのうせいがたわくせいMeanings1nounice giantastronomy›Astronomical term for a type of planet like Uranus and Neptune, characterized by a thick atmosphere of hydrogen, helium, and ices such as water, ammonia, and methane. Contrasts with 木星型惑星 (gas giant).See also: 木星型惑星
