Definition of pentagram noun from the Oxford Advanced Learner's Dictionary

 

pentagram

 noun
noun
BrE BrE//ˈpentəɡræm//
 
; NAmE NAmE//ˈpentəɡræm//
 
 
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a flat shape of a star with five points, formed by five straight lines. Pentagrams are often used as magic symbols. Word Origin mid 19th cent.: from Greek pentagrammon (see penta- and gram, sense 2).
See the Oxford Advanced American Dictionary entry: pentagram