Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “geo-”


prefix uk   /dʒiː.əʊ-/ us    /-oʊ-/
of or relating to the Earth: geophysics geologyThe Earth and outer space - general words
(Definition of geo- from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of geo-?
Add Cambridge dictionaries to your browser to your website

Definitions of “geo-” in other dictionaries

Word of the Day


a type of dark brown beer with a bitter taste

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More