noun
regular hexahedron; cube
Mathematical term for a cube, emphasizing its regularity as a Platonic solid.
正六面体は、すべての面が正方形である立体です。
A regular hexahedron is a solid whose faces are all squares.
立方体 is the common word for 'cube' in everyday contexts, while 正六面体 is a formal mathematical term.
Compound of 正 (regular) + 六 (six) + 面 (face) + 体 (body), a straightforward Sino-Japanese term for a regular hexahedron.