What does the greek root tech mean?

The Greek root "tech" actually doesn't exist on its own. The word "tech" in English is a shortened form of "technology," which comes from the Greek words τέχνη (tekhnē) and λογία (logia).

* τέχνη (tekhnē) means art, craft, skill, or technique. It refers to the practical application of knowledge and skills, often in a creative or innovative way.

* λογία (logia) means study, discourse, or theory. It refers to the systematic analysis or discussion of a subject.

Therefore, "technology" literally means "the study or discourse of art, craft, skill, or technique."

While "tech" doesn't have a direct Greek root meaning, it inherits the broader sense of craftsmanship, innovation, and the application of knowledge from its origin in "technology."