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octagon SimpleWikiWiktionaryGoogle検索CollinsCambridgeLongmanLongman英和Learners 【 27031 】 【意味】 "[名詞] an eight-sided polygon [例] The octagon is a regular polygon. [例] The octagon is a shape that is very useful in geometry. [例] They drew an octagon on the blackboard. [意味] 八角形, 八角 ; [上位語] polygon, polygonal shape ; [同義語群] 13882563-n"