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| ge·oid [ j òyd ] (plural ge·oids) |
noun |
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| Definition: |
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1. Earth's shape: the slightly flattened sphere that is the shape of the Earth, used in calculating the precise measurements of points on the Earth's surface
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2. hypothetical surface of the Earth: a hypothetical surface of the Earth that would exist if a cross section were taken at sea level
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| [Late 19th century. < Greek geoeidēs (see geode)] |
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 ge·oi·dal adjective |
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