Which of the Greek roots most closely means to track?

The Greek root that most closely means "to track" is "δρομος" (dromos).

Here's why:

* δρομος means "race course" or "running" and is related to the concept of movement and direction.

* It's the root of words like "dromomania" (a compulsion to travel), "aerodrome" (an airfield), and "syndrome" (a pattern or course of symptoms).

While other roots like "graph" (to write) or "logos" (word) can be related to tracking, "dromos" is the most direct and specific in meaning.