an imaginary surface that coincides with mean sea level in the ocean and its extension through the continents.
the geometric figure formed by this surface, an ellipsoid flattened at the poles.
Origin of geoid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for geoidal
Historical Examples of geoidal
Then there was the question of geoidal deformation, on which he had remained unaccountably silent.
a hypothetical surface that corresponds to mean sea level and extends at the same level under the continents
the shape of the earth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
The hypothetical surface of the Earth that coincides everywhere with mean sea level and is perpendicular, at every point, to the direction of gravity. The geoid is used as a reference surface for astronomical measurements and for the accurate measurement of elevations on the Earth's surface.
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