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Umbriel

[uhm-bree-el] /ˈʌm briˌɛl/
noun, Astronomy
1.
a moon of the planet Uranus.
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British Dictionary definitions for Umbriel

Umbriel

/ˈʌmbrɪəl/
noun
1.
one of the main satellites of Uranus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for Umbriel

third nearest of the five major moons of Uranus and the one having the darkest and oldest surface of the group. Its discovery is attributed to the English astronomer William Lassell in 1851, although the English astronomer William Herschel, who discovered Uranus and its two largest moons, may have glimpsed it more than a half century earlier. Umbriel was named by Herschel's son, John, for a character in Alexander Pope's poem The Rape of the Lock

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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