Definitions

1. noun

A three-dimensional solid with 10 faces, typically a polyhedron.

“The artist created a sculpture using multiple decahedra to form a large geometric structure.”

2. noun

A decagonal prism or any of various polyhedra with 10 faces, such as the dodecahedron and the rhombic decahedron.

“The crystallographer studied the unique properties of the rhombic decahedron in the crystal structure.”