| 单词 | planet x |
| 释义 | planet X[ plan-it eks ] / ˈplæn ɪt ˈɛks / noun Astronomy.a planet beyond the orbit of Pluto whose existence has been hypothesized but not confirmed. Origin of planet XFirst recorded in 1880–85 Words nearby planet Xplanetology, plane tree, plane trigonometry, planet-struck, planet wheel, planet X, planet Zog, planform, plangent, planh, plani- Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 |
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