noun Date: 1785 any of the five possible regular polyhedrons that include the regular forms of the tetrahedron, hexahedron, octahedron, dodecahedron, and icosahedron
REGULAR SOLID
Meaning of REGULAR SOLID in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012