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geoid
Definitions
[ˈdʒiːɔɪd], (Noun)
Definitions:
- a hypothetical solid figure whose surface corresponds to mean sea level and its imagined extension under (or over) land areas
Phrases:
Origin
:
late 19th century: from Greek geoeidēs, from gē ‘earth’ + -oeidēs (see -oid)
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definition by Oxford Dictionaries