What does the greek root vit mean?

The Greek root "vit" doesn't exist as a stand-alone root. It's likely you're thinking of "vita" which means "life" or "living".

Here are some words derived from "vita":

* Vital: Essential for life or existence.

* Vitamin: Organic compounds that are essential for life and growth.

* Vitamins: (plural form of vitamin)

* Vitality: Strength and energy.

* Vivacious: Lively and animated.

* Vitiate: To weaken or corrupt.

It's also possible you're thinking of another Greek root that sounds similar. Could you provide more context or the word you're trying to understand?