noun
- a three-dimensional geometric shape with eight flat triangular faces
Usage: geometry
Examples
- The crystal formed a perfect octahedron with eight triangular faces.
- In geometry class, we learned to calculate the volume of an octahedron.
- The diamond’s natural octahedron shape was clearly visible before cutting.
- An octahedron has six vertices and twelve edges.
- The molecular structure resembled a regular octahedron.
- She built an octahedron model using cardboard triangles.