noun, plural oc·ta·he·drons, oc·ta·he·dra [ok-tuh–hee-druh] /ˌɒk təˈhi drə/.
- a solid figure having eight faces.
noun plural -drons or -dra (-drə)
- a solid figure having eight plane faces
n.1560s, from Greek oktahedron, neuter of oktahedros “eight-sided,” from okta- “eight” (see octa-) + hedra “seat” (see sedentary). Related: Octahedral. Plural octahedrons octahedra
- A polyhedron that has eight faces.