[eks] /ɛks/

noun, Astronomy.
a planet (beyond the orbit of the dwarf planet Pluto) whose existence has been hypothesized but not confirmed.


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  • Planform

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  • Plangent

    [plan-juh nt] /ˈplæn dʒənt/ adjective 1. resounding loudly, especially with a plaintive sound, as a bell. /ˈplændʒənt/ adjective 1. having a loud deep sound 2. resonant and mournful in sound adj. “beating with a loud sound,” 1822, from Latin plangentem (nominative plangens), present participle of plangere “to strike, beat” (see plague (n.)). Related: Plangently.

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