a hypothetical surface that corresponds to mean sea level and extends at the same level under the continents the shape of the earth
WordReference Random House Unabridged Dictionary of American English © 2025
ge•oid
( jē′oid),USA pronunciation n.
ge•oi′dal, adj.
- Geographyan imaginary surface that coincides with mean sea level in the ocean and its extension through the continents.
- Place Namesthe geometric figure formed by this surface, an ellipsoid flattened at the poles.
- Greek geoeidé̄s earthlike. See geo-, -oid
- 1880–85
Collins Concise English Dictionary © HarperCollins Publishers::