American Heritage® Dictionary of the English Language, Fourth Edition
- n. The hypothetical surface of the earth that coincides everywhere with mean sea level.
Century Dictionary and Cyclopedia
- n. An imaginary surface which coincides with the mean sea-level over the ocean, and extends under the continents everywhere at that level at which the mean surface of the sea would stand if it were allowed to flow in through a small subterranean canal. The geoid has no simple geometrical form, but bulges out from the mean spheroid in some places (under the continents and some of the deeper parts of the ocean) and is depressed beneath the mean spheroid in other places.
- n. See geode.
- German, from Greek geoeidēs, earthlike : gē, earth + -oeidēs, -oid. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Let the term geoid apply to the natural irregular surface of the earth and the term spheroid to the ideal regular sur - face of the geodesist which coincides nearly with sealevel and is necessarily a level surface.”
“That span can then, in theory, be subtracted from the distance between those satellites and a kind of theoretical sea level known as the geoid, which is what the sea level would be at each point on Earth if undisturbed by weather, tides and currents.”
“A new map shows the Earth's "geoid" - the map of its gravitational pull.”
“Technically speaking, the model at the top of this page is what researchers refer to as a geoid.”
“The geoid is the shape of an imaginary global ocean dictated by gravity in the absence of tides and currents.”
“The geoid is a model of global mean sea level that is used to measure precise surface elevations.”
“Goce data will be used to construct an idealised surface called a geoid”
“This will result in a unique model of the geoid, which is the surface of equal gravitational potential defined by the gravity field.”
“This will result in a unique model of the geoid, which is the surface of equal gravitational potential defined by the gravity field - crucial for deriving accurate measurements of ocean circulation and sea-level change, both of which are affected by climate change.”
“The geoid is the equipotential surface of the earth’s gravitational field that approximates the mean sea surface.”
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