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octahedron

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