Umbriel (ŭm`brēĕl'), in astronomy, one of the moons, or natural satellites, of Uranus Uranus (y
rā`nəs, y
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Umbriel [′əm·brē·əl]
rā`nəs, y..... Click the link for more information. .
Umbriel [′əm·brē·əl]
(astronomy)
A satellite of Uranus orbiting at a mean distance of 165,300 miles (266,000 kilometers) with a period of 4.144 days, and with a diameter of about 740 miles (1190 kilometers).
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