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dodecagon

noun
🔊/dəʊˈdekəɡən/
🔊/dəʊˈdekəɡən/
 (geometry几何)
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  1. a flat shape with twelve straight sides and twelve angles十二边形；十二角形 compare dodecahedronTopics Colours and Shapesc2
    Word Originlate 17th cent.: from Greek dōdekagōnon, neuter (used as a noun) of dōdekagōnos ‘twelve-angled’.