synestiaWiktionary 原文/sɪˈnɛstɪə/构词拆解syn-前缀‘together’+Hestia词干syn-identical · with, together词源说明From syn- (“together”) + Hestia.释义名词noun1(astrophysics) A donut-shaped body of vaporized and molten rock formed from the collision of two planet-sized objects.