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pentane
pentangle
pentangular
pentanoic acid
pentapeptide
pentaploid
pentaprism
pentaquine
pentastich
pentastome
Pentateuch
pentathlete
pentathlon
pentatomic
pentatonic scale
pentavalent
pentazocine
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Pentagon

Pen·ta·gon


noun 
Definition:
 
U.S. Defense Department: the U.S. Department of Defense, or the five-sided main building that houses it

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