Answer: octahedrons

AnswerCrossword Clue
octahedronsOCTAHEDRON, (Greek) a solid bounded by eight plane faces also OCTOHEDRON
octahedronsA three-dimensional shape having eight plane faces, esp. a regular solid figure with eight equal triangular faces
octahedronsA body, esp. a crystal, in the form of a regular octahedron