octohedron

English

octohedron (plural octohedra or octohedrons)

Alternative form of octahedron
- 1795, J[ohann] G[ottfried] Schmeisser, “Zinc”, in A System of Mineralogy, Formed Chiefly on the Plan of Cronstedt, volume II, London: […] C. Dilly […], page 199:
  Its primitive figure ſeems to be the regular tetrahedron, which is variouſly modified by truncation, making it appear as octohedrons or hex-octohedrons.