regular tetrahedron

English Thesaurus

1. a tetrahedron with four equilateral triangular faces (noun.shape)

hypernym	:	ideal solid, platonic body, platonic solid, regular convex polyhedron, regular convex solid, regular polyhedron,
definition	:	any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent (noun.shape)