From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. The ninth planet of the Solar System, the smallest (5700 km radius) and most distant from the sun. The suggestion has been made that it more closely resembles a large close comet than a planet. Its orbit has an eccentricity of 0.248, larger than that of any other planet; it varies from 4.44 to 7.37 billion km distance from the sun. [PJC]
Pluto is an oddball among its eight sister planets. It's the smallest in both size and mass, and has the most elliptical orbit. It moves in a plane tilted markedly away from the other planets' orbits. Moreover, Pluto is the only planet made almost entirely of ice. --Ron Cohen (Science News, Feb. 27, 1999, p. 139)
From WordNet (r) 3.0 (2006) [wn]:
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