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Definition of gas giant noun from the Oxford Advanced Learner's Dictionary

gas giant

noun

/ˌɡæs ˈdʒaɪənt/

/ˌɡæs ˈdʒaɪənt/

(astronomy)

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a large planet made mostly of the gases hydrogen and helium, for example Jupiter or Saturn

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See gas giant in the Oxford Advanced American Dictionary

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