tetrahedronWiktionary 原文构词拆分tetra-前缀Four.+-hedron后缀(geometry) Forms the names of solid figures bounded by a certain number of planes (polyhedra).演变路径（由近及远）英语源自 ←古希腊语 τετράεδρον “triangle-based pyramid”原始词根原始印欧语 *sed-词源说明From Ancient Greek τετράεδρον (tetráedron, “triangle-based pyramid”), from τετράεδρος (tetráedros), from τετράς (tetrás, “four”) + ἕδρα (hédra, “seat”). By surface analysis, tetra- + -hedron.释义（英文）名词 Noun(geometry) A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.词族派生词（17）hextetrahedronhypertetrahedronpolytetrahedronsupertetrahedrontetrahedrane