ˈjēˌȯid noun
( -s )
Etymology: German, from Greek geoeidēs earthlike, from ge- + -oeidēs -oid
: the surface within or around the earth that is everywhere normal to the direction of gravity, coincides with mean sea level in the oceans, and approximates to the shape of an ellipsoid of revolution
• ge·oi·dal (ˈ)jē|ȯid ə l adjective