It comes from the Greek word theos, which means "god".
Here are some examples of words using the combining form "Theo-":
* Theology: the study of religion and the nature of God.
* Theocracy: a form of government in which religious leaders rule.
* Theosophy: a belief system that emphasizes divine wisdom and spiritual enlightenment.
* Pantheism: the belief that God is everything and everything is God.