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| plan·e·tes·i·mal [ plànnə téssəm'l ] (plural plan·e·tes·i·mals) |
noun |
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| Definition: |
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small rocky astronomical object: a small rocky astronomical object thought to have orbited the Sun in the early stages of the solar system before coalescing with others to form the planets
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| [Early 20th century. <planet, after infinitesimal] |
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