Dictionary

pentagonal

adjective pen·tag·o·nal \pen-ˈta-gə-nəl\

Definition of PENTAGONAL

1
:  having five sides and five angles
2
:  having a pentagon as a cross section or as a base <a pentagonal pyramid>
pen·tag·o·nal·ly \-nəl-ē\ adverb

First Known Use of PENTAGONAL

1571

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