Olympus Mons

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Olympus Mons

A volcano, about 25 km (16 mi) high, on Mars. It is the highest known mountain in the solar system.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Olympus Mons

n
(Celestial Objects) the highest of the giant shield volcanoes on Mars, lying 18°N of the equator. Height: 26 km; base diameter: over 600 km
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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And on Mons Olympus, the highest mount in the known universe, it would be thinner still.
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