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
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First Known Use of PENTAGONAL
1571
Rhymes with PENTAGONAL
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