Definition of geoid in English:



the geoid
  • A hypothetical solid figure whose surface corresponds to 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.’
    • ‘‘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.’
    • ‘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.’
    • ‘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).