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U·ra·nus (y-rānəs, yrə-nəs)
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n.
1. Greek Mythology The earliest supreme god, a personification of the sky, who was the son and consort of Gaea and the father of the Cyclopes and Titans.
2. The seventh planet from the sun, revolving about it every 84.01 years at a mean distance of approximately 2.9 billion kilometers (1.8 billion miles), having a mean equatorial diameter of 51,118 kilometers (31,763 miles) and a mass 14.6 times that of Earth.

[Late Latin Ūranus, from Greek ouranos, heaven, the god Uranus, Sense 2, from New Latin Ūranus, since Uranus was Saturn's father just as Saturn was Jupiter's father (thus making the order of the planets' names reflect mythological genealogy).]
(click for a larger image)
Uranus
false-color image taken by the Hubble Space Telescope in 1998

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.