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A region in the crust of a celestial body, such as the moon or the earth, that has a higher gravitational acceleration than that of the rest of the body, indicating a greater density of mass. Also called mascon.
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.