ice giant

Noun

ice giant (plural ice giants)

1. (Norse) A frost giant.
   • The drops became living by the power of him who had sent the wind ; and from them sprang Ymir, the ice-giant.1832, Francis Lieber, Edward Wigglesworth, Thomas Gamaliel Bradford, editors, Encyclopædia Americana; A Popular Dictionary of Arts, Sciences, Literature, History, Politics, and Biography, volume 9...
   • The three sons of Borr, Othin, Wili, and We, grandsons of Buri, the first man, slay Ymir, the father of the Hrimthursar or Ice giants, and his body serves them for the construction of the world.1879, “The Deluge: Its Tradition in Ancient Nations”, in The Contemporary Review, volume 36, London: Strahan and Company Limited, translation of Le déluge et l'épopée babylonnienne by François...
2. A giant planet composed mostly of astronomical ices (condensed forms of volatile compounds) including water, methane, oxygen, carbon, nitrogen, and sulfur, and smaller than a gas giant. (e.g. Neptune and Uranus)
   • The fifth planet was an unknown, an ice giant in a drunken skewed orbit that took it from just inside the Jovian's orbit almost out to the sixth planet's.1976, Larry Niven, “The House Divided”, in A World Out of Time, Holt Rinehart Winston, →ISBN, archived from the original on 03 Dec 2021, page 38

   Synonyms:

   ice giant planet, Neptunian planet