正せい多た面めん体たい

noun

regular polyhedron

A polyhedron whose faces are congruent regular polygons and whose vertices are all alike. Used in geometry.

• 正せい多た面めん体たいは全ぜん部ぶで五ご種しゅ類るいしか存そん在ざいしない。

  There are only five regular polyhedra in total.