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Definition of "dwarf planet" []

  • A celestial body that orbits the sun and is large enough to assume a nearly round shape, but that does not clear the neighborhood around its orbit and is not a satellite of a planet. See Usage Note at planet. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Words like "dwarf planet"