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Definition of geo- combining form from the Oxford Advanced Learner's Dictionary

geo-

combining form

/dʒiːəʊ/,

/dʒiːə/,

/dʒiˈɒ/

/dʒiːəʊ/,

/dʒiːə/,

/dʒiˈɑː/

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(in nouns, adjectives and adverbs) of the earth
- geochemical
- geoscience
Word Originfrom Greek gē ‘earth’.

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See geo- in the Oxford Advanced American Dictionary

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