from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One of the four gas giant planets in the solar system, Jupiter, Saturn, Uranus, and Neptune, which have very large masses and are farther from the sun than the terrestrial planets.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Either of the four gas giant planets in the Solar System: Jupiter, Uranus, Saturn, or Neptune.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun any of the four outermost planets in the solar system; much larger than Earth and gaseous in nature (like Jupiter)


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