First Known Use: 1881
Dictionary
geoid
noun ge·oid \ˈjē-ˌȯid\
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-ˈȯi-dəl\ adjective
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Origin of GEOID
German, from Greek geoeidēs earthlike, from gē
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