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geoid

Syllabification: (ge·oid)
Pronunciation: /ˈjē-oid/
Definition of geoid

noun

(the geoid)
  • the hypothetical shape of the earth, coinciding with mean sea level and its imagined extension under (or over) land areas.

Origin:

late 19th century: from Greek geoeidēs, from 'earth' + -oeidēs (see -oid)

geoid in other Oxford dictionaries

Definition of geoid in the British & World English dictionary
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