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sister planet. In DICTIOUS you will not only get to know all the dictionary meanings for the word
sister planet, but we will also tell you about its etymology, its characteristics and you will know how to say
sister planet in singular and plural. Everything you need to know about the word
sister planet you have here. The definition of the word
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English
Noun
sister planet (plural sister planets)
- (astronomy) a planet that shares similar physical characteristics, such as size, density and mass, with another planet