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pentagram

noun
🔊/ˈpentəɡræm/
🔊/ˈpentəɡræm/
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  1. a flat shape of a star with five points, formed by five straight lines. Pentagrams are often used as magic symbols.五角星形（常用于象征魔力）Topics Colours and Shapesc2
    Word Originmid 19th cent.: from Greek pentagrammon (see penta- and gram, sense 2).