octahedron [ˌɒktəˈhiːdrən, -ˈhɛd-] (pl. octahedra -drə 或 octahedrons)
a three-dimensional shape having eight plane faces, especially a regular solid figure with eight equal triangular faces 八面体 ■a body, especially a crystal, in the form of a regular octahedron (尤指结晶)正八面体
派生 octahedral adjective 语源
late 16th cent.: from Greek oktaedron, neuter (used as a noun) of oktaedros 'eight-faced'