Definition of geo- in English:

geo-

Pronunciation: /ˈdʒiːəʊ/

combining form

Relating to the earth: geocentric geochemistry

Origin

from Greek 'earth'.

Definition of geo- in:

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Word of the day meretricious
Pronunciation: ˌmɛrɪˈtrɪʃəs
adjective
apparently attractive but having no real value...