You searched for: “heptahedron
heptahedron (s) (noun); heptahedrons, heptahedra (pl)
Pertaining to a solid figure with seven flat sides or faces and straight edges: "A heptahedron has several different forms; in fact, heptahedra have several shapes in convex (curving or bulging outward; such as, the exterior of a sphere) and concave (curved like the inner surface of a sphere)."
This entry is located in the following unit: hepta-, hept- (page 1)