octahedron
noun /ˌɒktəˈhiːdrən/
/ˌɑːktəˈhiːdrən/
(geometry- enlarge imagea solid figure with eight flat sides, especially one whose sides are eight equal triangles
八面体;正八面体 词源late 16th cent.: from Greek oktaedron, neuter (used as a noun) of oktaedros ‘eight-faced’.