Heptahedron
/ˌheptəˈhiːdrən/
Definition 1 of 1
Pro Tip 1/3Geometry Term
Used mainly in geometry and mathematical contexts to describe a specific 3D shape. 
In geometry class, we studied how to calculate the surface area of a heptahedron.
Pro Tip 2/3Technical Vocabulary
It's a technical term, not commonly used in everyday conversation. 
The architect discussed the heptahedron structure for the new art installation.
Pro Tip 3/33D Shape Names
Similar to 'triangle' in 2D, 'heptahedron' describes a 3D shape with seven faces. 
She crafted a model of a heptahedron for her science project.