geoid noun. ['dʒi:ɔɪd] L19.
[Greek geoeidēs adjective, earthlike, from GEO-: see -OID.]
The earth's figure; a hypothetical solid figure the surface of which corresponds to mean sea level (and its imagined extension under land) and is perpendicular to the direction of gravity at all points.

■ ge'oidal adjective L19.

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