equatorial bulge(redirected from Bulge (Earth))
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The gradual increase of the radius of a planet or star from the poles to the equator, resulting in a deviation from a perfect spherical shape, caused by the object's rotation.
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.