Definitions for gas giant
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Princeton's WordNet
Jovian planet, gas giant(noun)
any of the four outermost planets in the solar system; much larger than Earth and gaseous in nature (like Jupiter)
Wiktionary
gas giant(Noun)
A large planet composed mostly of gaseous hydrogen and helium, along with methane and ammonia; possibly with a solid core.
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"gas giant." Definitions.net. STANDS4 LLC, 2013. Web. 26 May 2013. <http://www.definitions.net/definition/gas giant>.