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The hypothetical surface of the earth that coincides everywhere with mean sea level.
[German, from Greek geoeidēs, earthlike : gē, earth + -oeidēs, -oid.]
ge·oid′al (-oid′l) adj.
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.
1. (Geological Science) a hypothetical surface that corresponds to mean sea level and extends at the same level under the continents
2. (Physical Geography) the shape of the earth
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an imaginary surface that coincides with mean sea level in the ocean and its extension through the continents.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.