octahedron
n.
1560s, from Greek oktahedron, neuter of oktahedros "eight-sided," from okta- "eight" (see octa-) + hedra "seat" (see sedentary). Related: Octahedral.
〔李〕n.八面体 [-hedron=a solid figure with...sides] ←octa-，octo-[GK] =eight八
〔李〕n. 八面体 [octa- =eight] ←-hedron [GK] =a solid figure having...sides表示“⋯面体”