exoplanetWiktionary 原文中文来自 ECDICTn.外星球构词拆分exo-前缀“outside; extrasolar”outside; external+planet词根/词干演变路径（由近及远）英语源自 ←古希腊语 词源说明Constructed from Ancient Greek: exo- (“outside; extrasolar”) + planet.释义（英文）名词 Noun(astronomy, planetology) A planet which exists outside Earth's solar system.词族派生词（4）exoatmosphereexoatmosphericexoplanetaryexoplanetology