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Pluto a dwarf planet in the Earth's solar system with a highly elliptical orbit and a diameter of 2,370 kilometers, or approximately 1,475 miles. Pluto was formerly considered a planet in the solar system, the smallest and farthest from the sun, but it was reclassified in 2006 as a dwarf. However, the debate about the classification continues in the scientific community. [1/2 definitions]
wood louse any of certain small terrestrial crustaceans that have seven pairs of legs and flat elliptical bodies, such as the sow bug.