正せい十じゅう二に面めん体たい

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Meanings

1

noun

regular dodecahedron

mathematics

A polyhedron with twelve regular pentagonal faces; a term used in geometry.

正correct, justice, righteous

二two, two radical (no. 7)

面mask, face, features

体body, substance, object

正せい多た面めん体たい
正多面体 is the broader term for any regular polyhedron, while 正十二面体 specifically refers to the regular dodecahedron.

Compound of 正 (regular), 十二 (twelve), 面 (face), and 体 (body). The term is a direct calque from Western geometry.