Geoid

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Geoid

</dt>
The figure of the earth as defined by the geopotential surface which most nearly coincides with mean sea level over the entire surface of the earth. </dd>
Because of variations in the direction of gravity, to which it is everywhere perpendicular, the geoid is not quite an ellipsoid of revolution, the sea-level surface being higher under mountainous areas. Compare equilibrium spheroid, geosphere. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use