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pentathlete
pentathlon
pentatomic
pentatonic scale
pentavalent
pentazocine
Pentecost
Pentecostal
Pentelic marble
pentene
penthouse
pentimento
Pentland Firth
pentlandite
pentobarbital sodium
pentobarbitone sodium
pentode
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pentacle

pen·ta·cle [ péntək'l ] (plural pen·ta·cles)


noun 
Definition:
 
mathematics 
Same as  pentagram


[Late 16th century. < medieval Latin pentaculum, literally "little five" < Greek penta- "five"]
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