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The hypothetical shape of the earth, coinciding with mean sea level and its imagined extension under (or over) land areas.
- ‘The geoid is a hypothetical surface, on which the gravitational pull of the Earth is the same everywhere.’
- ‘The seven-year odyssey transformed the world in earnest by giving to science a new form for the globe - that irregular spheroid today called the geoid.’
- ‘‘We live on the crust, so we don't really notice the deviation from what would be sort of the normal form of the geoid,’ he said.’
- ‘To this end we used an integrated modelling technique that combines several regional geophysical observables (elevation, gravity, geoid and heat flow) with available seismic data.’
- ‘‘Now, we're ready to look at how the geoid varies over short periods of time,’ he adds.’
Late 19th century: from Greek geoeidēs, from gē ‘earth’ + -oeidēs (see -oid).
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