Etymology of the English word planetology
the English word planetology
using the English suffix -logy
derived from the English word planet
derived from the Old French word planete
derived from the Latin word planeta (planet)
derived from the Greek word planetes, πλανήτης (a rover ('planet'); an erratic teacher)
derived from the Greek word planes
derived from the Greek word planasthai
derived from the Proto-Indo-European root *pelə-
derived from the Greek word planao, πλανάω (to (properly, cause to) roam (from safety, truth, or virtue))