Look up: geoid

1. 
   Geoid
   The equipotential surface of the Earth`s gravity field which best fits, in the least squares sense, MEAN SEA LEVEL.
   Found on http://www.csc.noaa.gov/text/glossary.ht
   
   
2. 
   Geoid
   An imaginary shape for the earth defined by mean sea level and its imagined continuation under the continents at the same level of gravitational potential.
   Found on http://www.ordnancesurvey.co.uk/oswebsit
   
   
3. 
   geoid
   that figure of the earth the surface of which is everywhere perpendicular to the direction of apparent gravity Category: The cosmos • the gravitational equipotential surface(an ellipsoid)near the mean sea level which is used as a datum for gravity surveys Category: News-systems and communications
   Found on http://www.mijnwoordenboek.nl/definition
   
   
4. 
   Geoid
   The `geoid` is that equipotential surface which would coincide exactly with the mean ocean surface of the Earth, if the oceans were to be extended through the continents (such as with very narrow canals). According to C.F. Gauss, who first described it, it is the `mathematical figure of the Earth,` a smooth but highly irregular surface that corresponds not to the actual surface of the Earth's crust, but to a surface which can only be known throug...
   Found on http://en.wikipedia.org/wiki/Geoid
   
   
5. 
   geoid
   model of the figure of the Earth—i.e., of the planet`s size and shape—that coincides with mean sea level over the oceans and continues in continental ... [3 related articles]
   Found on http://www.britannica.com/eb/a-z/g/21
   
   
6. 
   geoid
   geoid A figure resembling the shape of the earth.
   Found on http://www.wordinfo.info/words/index/inf
   
   
7. 
   Geoid
   True shape of the Earth, which deviates from a perfect sphere because of a slight bulge at the equator.
   Found on http://www.physicalgeography.net/physgeo
   
   
8. 
   geoid
   The hypothetical shape of Earth’s globe used in geodetic calculations; the surface of the geoid is approximately the same as mean sea level envisaged as extending over the entire surface of the globe.
   Found on http://www.daviddarling.info/encyclopedi