from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A celestial body that is more massive than a gas giant planet but has insufficient mass to sustain the hydrogen fusion reactions that produce radiant energy in normal stars.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy A
starlikeobject that contracts to about the volumeof the planet Jupiterafter its formation phase; its massmay range from several times that of Jupiter, such that it fuses deuterium, up to just below the threshold of sustained hydrogenfusion.
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