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TeachMeFinance.com - explain geoid geoid The term 'geoid' as it applies to the area of Earth observation can be defined as ' A surface of constant gravitational potential around the Earth--an averaged surface perpendicular to the force of gravity'. The term 'geoid' as it applies to the area of coastlines can be defined as ' the equipotential surface of the earth's gravity field which best fits, in the least squares sense, mean sea level'. Previous 5 Terms: geogony geographic information system (gis) Geographic Information System (GIS) geography Geohydrology Next 5 Terms: Geologic assurance Geologic considerations Geologic sequestration Geological and geophysical (G) costs Geological repository About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.