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ice giant

[ ahys-jahy-uhnt ]
/ ˈaɪs ˌdʒaɪ ənt /
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noun Astronomy.

a giant planet composed mostly of elements heavier than hydrogen and helium: the two ice giants in our solar system are Uranus and Neptune, previously classified as gas giants, but now known to be made primarily of oxygen, carbon, nitrogen, and sulfur.

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Origin of ice giant

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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