D defs.my
Entry 1 sense Webster, 1913

octahedron

/(ŏk`tȧ*hē"drŏn)/ · oc·ta·he·dron · IPA /ˌɑktəhˈiːdrən/
01 n. A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.
  1. 1.
    A solid bounded by eight faces. The regular octahedron is contained by eight equal equilateral triangles.(Geom.)