noun
- Plural of heptahedron; polyhedra with seven faces.
Usage: mathematics; geometry
Examples
- The mathematician studied various heptahedra to understand their geometric properties.
- Among the heptahedra, the pentagonal prism is one of the most commonly encountered shapes.
- Students learned to classify heptahedra by counting their vertices, edges, and faces.
- The collection of heptahedra in the geometry lab included both convex and non-convex examples.