noun ge·oid \ˈjē-ˌid\

Definition of GEOID

:  the surface within or around the earth that is everywhere normal to the direction of gravity and coincides with mean sea level in the oceans
ge·oi·dal \jē-ˈi-dəl\ adjective

Origin of GEOID

German, from Greek geoeidēs earthlike, from
First Known Use: 1881


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